[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   What am I doing wrong?   Thanks in advance.