When talking to somone using the syntax
    ..person Hello
you can have the mud spell out the person's name for you by partly
typing in the person's name and ending it with a '.'.  For example:
    ..per. Hello
This will cause the mud to search for someone in the same room as
you are whose name starts with the letters 'per'.  It's case-
insensitive, so if it finds someone with the letters 'Per', that
will match as well.

This has two distinct advantages.
 1) You don't have to type quite so much.
 2) If the person isn't in the room or isn't logged in, then
    the MUD will tell you, and no one in the room with you will
    be any the wiser.

This also works on channels.