Dear Mighty MOnks, I need to call and external program in .exe file, I try to using the perl script to do some checking the only call this external exe program. What command I should use to execute this program. Using system? But the program is in a folder c:\Blat. And the command to execute the is have to be in the that directory, e.g c:\Blat\Blat test.txt -s "subject" -t aa@aa.com can the system command test on this long command, or is that anyway other to execute this command. Thank you. Ernest