I have misunderstanding :( !. maybe I can't make my question be clear to you. the glomosim is a network simualtor , whatever , when I want to execute the file (data.in). I go to cmd.exe and write the command (glomosim data.in) and press enter. So glomosim here is a command , as you have said, I want to pass this command (glomosim data.in) and run it on cmd.exe from perl. when I write :

@args = ("glomosim", "c:\\glomosim\\bin\\data.in");
        system(@args) == 0 or die "system @args failed: $?";
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I got the error : can't spawn "cmd.exe" : No such file or directory at run_FtpGen.pl line 71 system glomosim c:\glomosim\bin\data.in failed ... I am beginner with perl and using windows7, so sorry for my many questions. :) Thank you