[PHP] Program execution functions doesn´t work in my system

[Beginning PHP Programmer]

Hi 

In the PHP manual there are some program execution 
functions like passthru(), exec() and system().
I´ve got PHP4 installed on IIS 5.0 on Windows 2000 
Server, and it works fine.

I tried with a very simple script like the 
following:

? $commandstring = 
"cmd"; 
passthru($commandstring);?

But it doesn´t work. You can see this warning in 
the explorer:

Warning: Unable to fork [cmd] in 
d:\inetpub\wwwroot\nntpadm\creategroup.php on line 3

I need to run some external programs from a PHP 
script. 
How could I do that?

Thanks in advance.
Rub

[PHP] Running external programs

[Beginning PHP Programmer]

Hi:

I´m using PHP4 on IIS 5 on Windows 2000 Server and 
it works fine. 
The Microsoft NNTP Service from IIS 5 can be 
managed from command shell with commands like this bellow:

cscript d:\\temp\\rgroup.vbs -t a -g 
new.group.01
And it works also fine in my system.


But, when I try to run a program from a simple PHP 
script like the following:

? $commandstring = 
"cscript d:\\temp\\rgroup.vbs -t a -g new.group.01"; 
passthru($commandstring);?

I get this Warning..

Warning: Unable to fork [cscript 
d:\temp\rgroup.vbs -t a -g new.group.01] in 
d:\inetpub\wwwroot\nntpadm\creategroup.php on line 3

Whatam I doing 
wrong?

Thanks in advance.