I see ArcaOS provides top, so I can find PIDs there.
If you use TOP, you might as well kill processes with that. PKILL does not need a PID, it will kill by name. For instance, if you need to kill the CUPS darmon (CUPSD), just do PKILL CUPSD, and it will do it. Be aware, that CUPSD has backup capability, so you need to kill it multiple times (4, I think) to convince it to go away Most programs don't do things like that.
yes I trust you, but I cannot decode this answer, still need to understand how to install and make it work.
If you are using eCS, or ArcaOS, CADH (Ctrl-Alt-Del Handler) is installed by default. TOP is also included in the CADH menu. Just do Ctrl-Alt-Del, and it should open the menu (as long as the system is responding). The rest is pretty obvious, and TOP is one of the options.
If you have an earlier version of OS/2, you would need to install the programs. I haven't seen that part for many years, I would assume that there are instructions included.