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.