Note: The titular question applies only to different ways in Perl.

I am planning to write a small guide/comparison of the different ways to start a process in Perl and while thinking about all the ways i do know, became certain that:

1. my knowledge about the ways i know is not complete

2. there will be ways i do not even know about

Thus i am turning to the Perl community for help. Please tell me what ways you know to start a process in Perl and all of the permutations it can go through. :)