Really? That's weird. I'm running Maple 9.5, how about you? If I do the following (outside of a procedure) then everything works: > with(process); [block, exec, fork, kill, launch, pclose, pipe, popen, wait] > launch( "notepad.exe"); And up comes notepad. But if I run my procedure, I get: > RunNotepad(); proc() (process:-launch)("notepad.exe") end proc; Very strange..... thanks for your help, ricky

Really? That's weird. I'm running Maple 9.5, how about you? If I do the following (outside of a procedure) then everything works: > with(process); [block, exec, fork, kill, launch, pclose, pipe, popen, wait] > launch( "notepad.exe"); And up comes notepad. But if I run my procedure, I get: > RunNotepad(); proc() (process:-launch)("notepad.exe") end proc; Very strange..... thanks for your help, ricky