3.5 I've heard about a command called KILLSESS to get rid of VT sessions, but cannot find it documented. How do I use it?

:NSCONTROL KILLSESS=#S666

I find it much more reliable than ABORTJOB for hung/unstable VT sessions. Issuing KILLSESS against a DTC session returns:

NO INCOMING VTSERVER IN THE GIVEN SESSION (DSERR 664)

If I am trying to abort a session, I routinely use KILLSESS first, followed by ABORTJOB if it is not a VT session.

You have to have NM capability to use KILLSESS. And, as of MPE/iX 6.0 PowerPatch 1, it is still undocumented in the HELP system.