The same way as you would execute any other program on said machine. It isn't Perl specific, but it's specific on the remote (and local) machine configuration - and any routers/firewalls in between.

Typical ways include using rsh (called remsh on some OSses), or UUCP (who remembers working with UUCP?). Unsafe methods, both of them. A someone safer method is the use of ssh - but that's harder to script if you want to make it secure.

But there are other ways. HTTP for instance, in combination with CGI. Or the use of inetd. You could even share a disk with a remote machine and trigger execution that way.

Note that none of the method is Perl specific, and none of the methods is a "will work anywhere" solution.

Abigail