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QAIX > C/C++ ProgrammingGo to page: « previous | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | next »

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Thursday, 8 March 2007
Fwd: SQL integration with C++ FiRe 10:20:07
 ---------- Forwarded message ----------
From: FiRe < bhratbrij-Re5JQEeQq­e8AvxtiuMwx3w@public­.gmane.org [mailto:bhratbrij-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org]>
Date: Dec 28, 2005 8:54 PM
Subject: SQL integration with C++
To: c-prog-unsubscribe-­hHKSG33TihhbjbujkaE4­pw@public.gmane.org [mailto:c-prog-unsubscribe-hHKSG33TihhbjbujkaE4pw@public.gmane.org]

HI everyone..

I have a project in my college in which i have to integrate c++ with a
database (sql) as back end.
I have no clue how to do it?
I have google it a lot but could only find VC++ integraton with sql
not c++.
So,please help me.

CHEERS.....

BHRAT BRIJ

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FiRe

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comment 13 answers | Add comment
Tuesday, 13 February 2007
old inport, outport Maurice 13:20:25
 Hello:
I've made a program that command external hardware using the parallel port,
everything was ok under win98.
Now I've tried it under windows xp, it didn't work. (I use inport() and
ouport() functions).

Any idea??
thanks
Maurice
comment 1 answer | Add comment
[ROOT] Loading a user-defined function in ROOT Germano Percossi 03:00:59
 Hi everybody,
I've subscribed only a few time ago this ML and
surely this question has been answered in another
thread. I apologize in advance if this is the case.
Anyway, I have some problems loading a function
written by me; I load the function with

gROOT->LoadMacro("n­ame_of_file_of_my_fu­nc")

with previous versions I used .L to load it.
If I'd need to change my function is there a way
to unload the old one and load a new one?
Till now I load the new one with the same name,
hoping to do the right thing but typing

root [56] gROOT->GetListOfGlo­balFunctions()->ls()­

I had the errors written at the end of the e-mail
and I cannot do anything else than kill root from
another shell. I've done anything wrong? Is there
any workaround?
I'm running a precompiled version of root
(v4.00.04 with gcc 3.3.2) on a Linux machine with
gcc 3.4.1.

Greets, Germano Percossi

*** Break *** segmentation violation
Generating stack trace...
0x406470f7 in G__interpret_func + 0x1692 from
/usr/local/root/lib­/libCint.so
0x4063cc83 in G__compile_bytecode­ + 0x203 from
/usr/local/root/lib­/libCint.so
0x406cad05 in G__MethodInfo::GetB­ytecode() +
0x5d from /usr/local/root/lib­/libCint.so
0x4018baff in TFunction::Interfac­eMethod() const
+ 0x31 from /usr/local/root/lib­/libCore.so
0x4017a011 in
TCint::UpdateListOf­GlobalFunctions() + 0x111 from
/usr/local/root/lib­/libCore.so
0x40139b04 in
TROOT::GetListOfGlo­balFunctions(bool) + 0xac from
/usr/local/root/lib­/libCore.so
0x402c7788 in <unknown> from
/usr/local/root/lib­/libCore.so
0x40656373 in G__call_cppfunc + 0x258 from
/usr/local/root/lib­/libCint.so
0x40646163 in G__interpret_func + 0x6fe from
/usr/local/root/lib­/libCint.so
0x4062b1d5 in G__getfunction + 0x12b4 from
/usr/local/root/lib­/libCint.so
0x406b335a in G__getstructmem + 0x235 from
/usr/local/root/lib­/libCint.so
0x406aca12 in G__getvariable + 0x4a9 from
/usr/local/root/lib­/libCint.so
0x406b38c9 in G__getstructmem + 0x7a4 from
/usr/local/root/lib­/libCint.so
0x406aca12 in G__getvariable + 0x4a9 from
/usr/local/root/lib­/libCint.so
0x406228fe in G__getitem + 0x5bf from
/usr/local/root/lib­/libCint.so
0x40621524 in G__getexpr + 0x77ec from
/usr/local/root/lib­/libCint.so
0x4066bad2 in G__exec_function + 0x1d5 from
/usr/local/root/lib­/libCint.so
0x40672619 in G__exec_statement + 0x23bd from
/usr/local/root/lib­/libCint.so
0x4060ab1d in G__exec_tempfile_co­re + 0x2bd from
/usr/local/root/lib­/libCint.so
0x4060acee in G__exec_tempfile_fp­ + 0x22 from
/usr/local/root/lib­/libCint.so
0x4067a767 in G__process_cmd + 0x471a from
/usr/local/root/lib­/libCint.so
0x401799bf in TCint::ProcessLine(­char const*,
TInterpreter::EErro­rCode*) + 0xa9 from
/usr/local/root/lib­/libCore.so
0x400f1470 in TApplication::Proce­ssLine(char
const*, bool, int*) + 0x596 from
/usr/local/root/lib­/libCore.so
0x40e74f4f in TRint::HandleTermIn­put() + 0x1dd
from /usr/local/root/lib­/libRint.so
0x40e73d3a in TTermInputHandler::­Notify() + 0x24
from /usr/local/root/lib­/libRint.so
0x40e759de in TTermInputHandler::­ReadNotify() +
0x12 from /usr/local/root/lib­/libRint.so
0x401e6388 in TUnixSystem::CheckD­escriptors() +
0xf2 from /usr/local/root/lib­/libCore.so
0x401e5bdd in
TUnixSystem::Dispat­chOneEvent(bool) + 0xf7 from
/usr/local/root/lib­/libCore.so
0x40147df0 in TSystem::InnerLoop(­) + 0x18 from
/usr/local/root/lib­/libCore.so
0x40147d95 in TSystem::Run() + 0x6f from
/usr/local/root/lib­/libCore.so
0x400f2069 in TApplication::Run(b­ool) + 0x2d
from /usr/local/root/lib­/libCore.so
0x40e74a2e in TRint::Run(bool) + 0x30a from
/usr/local/root/lib­/libRint.so
0x08048e45 in main + 0x71 from
/usr/local/root/bin­/root.exe
0x40fb6ea0 in __libc_start_main + 0xe0 from
/lib/tls/libc.so.6
0x08048d45 in
TApplicationImp::Sh­owMembers(TMemberIns­pector&,
char*) + 0x31 from /usr/local/root/bin­/root.exe
Root > Function Energy() busy flag cleared
Function () busy flag cleared
Function () busy flag cleared
Function () busy flag cleared
Function () busy flag cleared
Function () busy flag cleared
Function () busy flag cleared

--
\ | /
(@ @)
-o00-(_)-00o-------­-----
-------------------­--------------------­--------------------­-
Germano Percossi
University of Rome "Tor Vergata" and INFN Roma2
Via della Ricerca Scientifica 1
I-00133 Rome Italy
Phone : 06 7259 4824
Room : c0 28b
-------------------­--------------------­--------------------­-


comment 9 answers | Add comment
Monday, 12 February 2007
need help handling access violation 0xC0000005 Parthasarathy Regupathy 14:24:10
 

hi groups,
when i compile the 'C' in VC++ working with inserting nodes, i get
this error "Unhandled exception in
insertingnodes.exe:­0xC0000005:Access Violation." what shuld i do to
handle this error and how can i rectify..

can anybody help me...

tanx
regards with luv
partha







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comment 3 answer | Add comment
Saturday, 27 January 2007
Playing WAV files using C/C++ Wiz_mci 21:03:47
 Does anyone know how one can play WAV files using C/C++ in linux?. Are
there any libraries available? Any sample code out there?



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comment 2 answer | Add comment
Windows/Linux GUI development library John Matthews 20:41:49
 Hi- I'm currently looking at wxWidgets http://www.wxwidget­s.org/ as a
way of writing C/C++ GUI programs that will run under Linux and
Windows. However, I'm open to alternative suggestions- does anyone
know of anything better?

BTW the application I'm writing is a log file viewer. The current
version is in C, and decodes and displays telecomms (WiMAX) equipment
messages using indentation to aid interpretation eg.

message 1
first field of message 1
an array in message 1
1st item in array
:
message 2
etc.

In the past I've written this sort of thing just for Windows in Delphi
and used a TreeView component to effectively replace the indentation
eg. initially

+ message 1
+ message 2

Click on + of message 1:

- message 1
first field of message 1
+ an array in message 1
+ message 2
etc.

I've 20+ years of embedded C experience, but not much C++ (yet), and
no 'real' Windows programming experience (Delphi simplifies things),
so the simpler the better.

Cheers
John



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comment 1 answer | Add comment
[ROOT] connecting signals & slots Roger Mason 20:11:51
 Hello,

I need to connect a signal (from a TGButton "Fit") to a slot (something
like DoFit()) passing a load of arguments. The arguments will need to
consist of the starting parameters for the fit and, presumably, the
TGraph containing the data to be fitted and the TF1 that represents
the summ of the fit functions.

I have looked through the tests and tutorials but did not find an
example close to what I need.

Thanks for any help,

Roger


comment 11 answers | Add comment
Quest: Regarding zombie process. mano M 15:08:59
 I am trying to simulate a zombie process with the following simple
c program.include<sig­nal.h>
int main()
{
if(fork()>0)
{
printf("Inside parent process");
sleep(50);
}
}
Child process became zombie as soon as it finishes in Linux. But when
i tried in solaris 5.10 and aix 5.3 , it didn't became zombie.It is
cleaned from the process table ,still parent running without wait. Any
one knows the reason for that?Signal handling would be varied from OS
to OS?RegardsMano

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Add comment
[ROOT] ACLiC: vector::iterator problem and "no plugin for TSystem" Dr. John Krane 00:15:45
 Hi everyone,

Some of you might remember I had some trouble updating Root v4 to Root
v5 some time ago. I had the poor judgement to copy my root binaries and
libraries directly into /bin and /lib, and created an /include
directory, which caused a world of trouble when it came time to update.
(Since I had also defined $ROOTSYS and added it to associated PATHs, I
really don't know what I was thinking copying over all those files.)

Anyway, I recently tried to update to v5 again and thought I was
successful. I removed all the root files from /bin and /lib, removed
/include, updated all my environmental variables, and was able to
compile libraries that depend on Root, and also when I run Root the
splash page says Root v5.14/00b, as does the welcome message in the
terminal window. (In my earlier attemps, there was an obvious mismatch
between the splash screen and the welcome message, showing me I was
getting a mix of library versions.) I am able to use ACLiC to compile
*most* code I want from within Root, but I am getting a strange failure
today. I can only assume it is another v4 legacy on my end, but maybe not.

As you can see below, I'm getting a failure trying to ".L kRow.cpp+",
complaining about my vector::iterator declaration, yet no problem
reported by the compiler in the subsequent validity test. With the
debug mode set to 5, I see "did not find plugin for class TSystem..."
messages, but nothing more enlightening (to me). Does anybody know what
my problem might be? I have looked at the ACLiC web page and found many
cautions about using STL, but what I'm doing seems simple and worked in v4.

Here is my Root session, followed by the code in question:

* Version 5.14/00b 17 January 2007 *
* *
* You are welcome to visit our Web site *
* http://root.cern.ch­ *
* *
*******************­********************­****

FreeType Engine v2.1.9 used to render TrueType fonts.
Compiled on 26 January 2007 for linux with thread support.

CINT/ROOT C/C++ Interpreter version 5.16.16, November 24, 2006
Type ? for help. Commands must be C++ statements.
Enclose multiple statements between { }.
root [0] gDebug =5;
root [1] .L kRow.cpp+
Info in <TPluginManager::Fi­ndHandler>: did not find plugin for class
TSystem and uri /data/kranelib/util­/.
Info in <TPluginManager::Fi­ndHandler>: did not find plugin for class
TSystem and uri /data/kranelib/util­/./kRow_cpp.so
Info in <TUnixSystem::ACLiC­>: creating shared library
/data/kranelib/util­/./kRow_cpp.so
Info in <TPluginManager::Fi­ndHandler>: did not find plugin for class
TSystem and uri
/data/z_packages_an­d_software/rpm_by_ha­nd/root/current/etc/­system.rootmap
Info in <ACLiC>: creating the dictionary files
Info in <ACLiC>: rootcint
--lib-list-prefix=/­data/kranelib/util/.­/fileqDTxjTmap -f
/data/kranelib/util­/./fileaWohGY.cxx -c -p -I$ROOTSYS/include
-I"/data/z_packages­_and_software/rpm_by­_hand/root/current/i­nclude"
/data/kranelib/util­/./kRow.cpp /data/kranelib/util­/./file5yQHZVlinkdef­.h
Error: Symbol iteratorfield0 is not defined in current scope kRow.h:14:
Warning: Error occurred during reading source files
Warning: Error occurred during dictionary source generation
!!!Removing /data/kranelib/util­/./fileaWohGY.cxx
/data/kranelib/util­/./fileaWohGY.h !!!
Error: rootcint: error loading headers...
Error in <ACLiC>: Dictionary generation failed!
Info in <ACLiC>: Invoking compiler to check macro's validity
Info in <ACLiC>: g++ -c -O -pipe -Wall -W -Woverloaded-virtua­l -fPIC
-Iinclude -pthread -I$ROOTSYS/include
-I"/data/z_packages­_and_software/rpm_by­_hand/root/current/i­nclude"
-I/data/kranelib/ut­il/. -I/data/kranelib/ut­il
/data/kranelib/util­/./kRow.cpp
Info in <ACLiC>: The compiler has not found any problem with your macro.
Probably your macro uses something rootcint can't parse.
Check http://root.cern.ch­/root/Cint.phtml?lim­itations for Cint's
limitations.
Info in <TPluginManager::Fi­ndHandler>: did not find plugin for class
TSystem and uri /data/kranelib/util­/./kRow.o
Info in <TPluginManager::Fi­ndHandler>: did not find plugin for class
TSystem and uri /data/kranelib/util­/./fileaWohGY.cxx
Info in <TPluginManager::Fi­ndHandler>: did not find plugin for class
TSystem and uri /data/kranelib/util­/./fileaWohGY.h
Info in <TPluginManager::Fi­ndHandler>: did not find plugin for class
TSystem and uri /data/kranelib/util­/./fileaWohGY.o
Info in <TPluginManager::Fi­ndHandler>: did not find plugin for class
TSystem and uri /data/kranelib/util­/./file5yQHZVlinkdef­.h
Info in <TPluginManager::Fi­ndHandler>: did not find plugin for class
TSystem and uri /data/kranelib/util­/./fileqDTxjTmap.in
Info in <TPluginManager::Fi­ndHandler>: did not find plugin for class
TSystem and uri /data/kranelib/util­/./fileqDTxjTmap.out­
Info in <TPluginManager::Fi­ndHandler>: did not find plugin for class
TSystem and uri /data/kranelib/util­/./file5qRlmVcpp
Info in <TPluginManager::Fi­ndHandler>: did not find plugin for class
TSystem and uri /data/kranelib/util­/./fileQ2NfpX
root [2]


Here is the simple class that I was trying to compile, which worked
under Root v4:

kRow.h -------------------­--------------------­--------
#ifndef kRow_H
#define kRow_H

#include <vector>
#include "TString.h"

using std::vector;

class kRow {

private:
vector<TString>::it­erator field0;

public:
kRow(vector<TString­>::iterator p) {field0=p;}
~kRow() { }

void Close(Option_t *option=""){ option=0; }
ULong_t GetFieldLength(Int_­t field){ field=0; return 0; } // not
implemented
const char *GetField(Int_t field);
const char *operator[](Int_t field) { return GetField(field); }

};

#endif

kRow.cpp -------------------­--------------------­--------
#include "kRow.h"

const char *kRow::GetField(Int­_t field){
return *(field0+field);
}






comment 2 answer | Add comment
Friday, 26 January 2007
problem with boost::strong_compo­nents Tamas Marki 11:31:24
 Hello,
I'm trying to use the boost library's strong_components function to
partition a graph to connected sub-partitions, and ran into a problem.
Namely, when I generate the graph, for some reason the 'names'
(indices) of the vertices have some gaps (basically the graph that
needs to be partitioned is generated from another graph by throwing
out a bunch of vertices).
When I pass this graph to the function, it will count the left out
vertices and treat them as 1-vertex sub-partitions, which is not
desired. I then tried to use the vertex_index_map named parameter,
that I thought would solve this. I used something like this (not the
actual code as it would be too big)

std::vector<int> other;
// fill up the vector with the vertices by pushing back each one. The
number of vertices is about 170k and the biggest vertex index is about
260k.
// ..
// bigedges and bigweights have the edges and the weights, dim is the
total number of vertices - all these are checked and proper.

graph_t cityg (bigedges.begin (), bigedges.end (), bigweights.begin
(), dim);
std::vector<int> component(num_verti­ces(cityg));
int num = strong_components(c­ityg, &component[0],
boost::vertex_index­_map (&other[0]));

I must be doing it wrong, since it segfaults. The documentation says
"This maps each vertex to an integer in the range [0, num_vertices(g))",
that's why I thought it would work this way, but it does not.
The obvious solution would be to throw out 1-vertex partitions, but
I'd really like to know what's the proper way of doing this.
Thanks in advance for any help!

Tamas

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comment 2 answer | Add comment
Re: Huge memory model problem in 3.1 Bob Gonder 00:23:24
 Z.K. wrote:
Now, I was able to compile the program using the huge memory model, >but now the com ports won't open.

Did you check out the error codes?
Which of the hundred or so methods do you use to "open the com ports"?
Make sure the parameters are the correct size/type.
(Show us the code)
If I remove some of the code and compile >using the large memory model as before, the com ports work just fine.>Anyone have any ideas on how to fix this?

I beleive DGroup is the data group, not code, so reduce your data to
fit in large model.
Find large arrays, and allocate them at run time instead of compile
time.
Move larger arrays into their own C modules.
comment 4 answer | Add comment
Thursday, 25 January 2007
Questions on make Raghunand Naganand 18:23:14
 Hi,

I have the following questions:

1. What are sys/ and obj/ directories ?
2. Why do we "make dependencies" in sys directory ?
3. Why do we build only in obj/ directories ?
4. What is the speciality of these two directories ?

Awaiting your response ...

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comment 1 answer | Add comment
Re: Solution of b = ++a + ...... Brett W. McCoy 18:00:04
 (Please don't send me private emails on this topic)

We have made this issue clear, regardless of the logic you are
stepping through, there is no guarantee that all compilers will follow
your logic. This is considered undefined behavior because it results
in ambiguous side effects -- you are modifying the same variable
several times through the same sequence point. Please refer to the FAQ
link that was provided for a thorough and definitive explanation of
this.

No one should be writing production code like this to begin with. If I
found this kind of thing in a code review, you would be asked to
rewrite it.

-- Brett

On 1/25/07, rajesh bisht <delhi_bisht-/E1597­aS9LQAvxtiuMwx3w@pub­lic.gmane.org> wrote:> -------------------­--------------------­--------------------­--------------------­--------------------­-------Dear> Solution of u r problem :> solution :> 1 : b = ++a + a++ + a++ + a++; (Your problem).> Consider : I have mark red which have pre - increment operator> And Mark with Blue, which have post - increment operator.> Now, ++a = 2 (Only mention increment value with associate pre-operator> variables)> We have not any another pre-operator variable in the expression.> Now count total number of variables of the expression.> There is 4 .( 1 have pre-operator and 3 have post operator).> So. We have value of a =2.> There is 4 variables so Answer should be = 2 * 4 =8;> Let show another examples:>
A : b = ++a + ++a + a++ + a++> B : b = a++ + ++a + ++a + a++ + a++ ;> C: a++ + a++ + a++ + a++;> D : ++a + ++a + ++a;>
Answer : A : There are 2 variable with pre-operator.> Such that ++a = 2, then ++a = 3;> Now current value of a = 3;> Total no of variables in the expression = 4;> So Answer = 3 * 4 = 12> Similar way For B: 2 varialbes with pre-operator.> So ++a = 2 then ++a = 3; (3 is last value of a by pre-operator)> No of variables = 5, so Answer = 5 * 3 = 15>
Similar way : C : not any pre-ioperator so value not should be increment> So a = 1, no of variables = 3; Answer = 3*1 = 3.>
Similar D : 3 variable with pre-operator.> So ++a =2; then ++a = 3;then ++a = 4;> Current value of a = 4 , no of varables = 3;> Answer = 3*4 = 12;>
I hope now u will understood a well. See u again.>
"Thanks & Regard's: Rajesh Bisht. - Delhi."> -------------------­--------------------­--------------------­--------------------­--------------------­-------> smartandkewl <idragosani-Re5JQEe­Qqe8AvxtiuMwx3w@publ­ic.gmane.org> wrote:> Please do not send binary attachments>
Dear find Attachement for the solution.> > Thanks : Rajesh Bisht> >
Gaurav J wrote:> >
"Brett W. McCoy" wrote: On 1/21/07,> ankurnot4u wrote:> > > this is some thing intresting !> > >
can any one tell why the output of this code is 8 ??> > >
{> > > int a=1,b;> > > b = ++a + a++ + a++ + a++;> > > cout<> > }> >
You are invoking undefined behavior:> >
-- Brett> >
-------------------­--------------------­------------------->­ > "In the rhythm of music a secret is hidden;> > If I were to divulge it, it would overturn the world."> > -- Jelaleddin Rumi> >
well actually its simple.> > initially a=1> > b=++a + a++ + a++ + a++ ---->in this expression u first use a> pre-increment operator. so a becomes 2.> > now the calculation becomes b=2 + 2 + 2 +2 =8.> > the a++ in the remaining part is a post-increment operator.it is> only carried out after the expression is calc.> > hope u understood> >
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Add comment
VC++ and Java wh one is best Bilal Jan 17:57:07
 hello everyonei am a student of comp engg and i have to choose one
language JAVA or VC++ in my next term elective cource. i have heard
that VC++ is more verstile and is also in now a dayz where as Java has
not much applications area.can u plz guide me wh language is better .regardsahmed
bilal

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comment 52 answer | Add comment
[ROOT] get maximum & minimum x from TGraph Roger Mason 14:53:58
 Hello,

Is there a way to get the maximum and minimum x values from a TGraph?

Thanks,
Roger


comment 4 answer | Add comment
Re: VC++ and Java wh one is best [+1 OT] Thomas Hruska 05:25:40
 Victor A. Wagner Jr. wrote:> At 10:55 2007-01-22, Thomas Hruska wrote:>> *NEW* VerifyMyPC 2.0>> Change tracking and management tool.>> Reduce tech. support times from 2 hours to 5 minutes.>
btw, I'm having some problems w/ VerifyMyPC. ...there seems to be > NO way to tell it anything....like I'm doing regression testing and > that generating 45 new/different .DLL files isn't a problem. That's > what I'm SUPPOSED to be doing... making new .dll files and testing > them. (it's the boost library, just in case you're interested)

I have one directory that bothers me too. I've got a NT-junction point
mapped directory to a USB drive. It would be nice to ignore that
directory. You can bet your britches that it will be a feature in a
later version.

I spent the majority of 2.0 just re-writing the scanning engine and
pulling teeth to make it go faster. The GUI is something that will
definitely improve. There are still many things that bother me about
the GUI...and what bothers me usually gets fixed.

Keep in mind, though, that I'm not really targeting developers for
VerifyMyPC. Well I am, but I'm not at the same time. We change way too
much stuff on our own computers every day for it to be useful beyond a
"yup, I remember doing that" and exiting the program after a two-second
glance (with the occasional, "cool, it picked up those changes"). We
are also considerably more careful about what gets put on our computers
in the first place. On the average user's computer, however, is where
it comes in really handy. Everyone I run into who asks me for computer
help draws a complete blank if I ask "what did you do?" They don't
remember. And I certainly don't know. But, assuming it is installed on
their computer, VMPC keeps track of that information for them.

If the Notifier bothers you - that is, the balloon tip thing - you can
disable that from the Task Scheduler. I plan on making it significantly
smarter anyway (the notifier bothers me in its current incarnation).

Lots of stuff to do - not enough time to do it all in.

--
Thomas Hruska
CubicleSoft President
Ph: 517-803-4197

*NEW* VerifyMyPC 2.0
Change tracking and management tool.
Reduce tech. support times fr