PR: ports/4887 Submitted by: jonny@coppe.ufrj.br
any combination of user names, ttys, commands, and pids. `snice' is a program which changes the priority of processes (given the same). PR: ports/3783 Submitted by: Joao Carlos Mendes Luis <jonny@mailhost.coppe.ufrj.br> (w/minor hacks by me)