The PsKill utility allows you to forcibly terminate a running process, similarly to the WMI Kill Process action. See the PsKill help topic in the Pstools help file for more details.
Process ID/Name
Specify a process ID or name. Partial names can be given (ie in the example above, firefox will match firefox.exe or firefox-2.exe.)
Kill process' descendents as well (-t)
If this option is checked, PsKill will also kill the process' descendents in the process tree.
"Remote" Tab
See the PsTools Common Options topic.