Description from the author:
"PSPM graphically displays the status of all processes running in OS/2. PSPM allows you to display information about any process, including thread information, to terminate a process or an entire process tree, or to switch to a running process."
PSPM (or a similar tool) is necessary if a program using VREXX crashes without calling VEXIT. In this case you must delete the invisible process created by VREXX manually before you can use VREXX in other REXX programs.