You are looking at a command called logoff

logoff
logoff {final action}

Logoff will disconnect you from cow and everyone everywhere will know about it.

If you want specify what is shown when you logoff, just include the text as if you were using the do command. read the command called do

eg:
logoff or
logoff fades away into nothingness

read the command called quit


Scripting notes
This generates a trigger word of 'sleeps' which is echoed through cow. The librarian is a sample object which reacts to this and records the fact in the read the logonlist.
Code