Hi, I have a situation where a C main program needs to call another C main program, my background is mostly Windows and I'm new to UNIX programming. I've read about system(), fork(), and exec() and I'm a little confused as to what the sequence of steps should be to launch another process. By the way the parent program would have to suspend execution until the child program returns and parent program would need to read the return or exit code of the child program. Thank you in advance for your help.