From Tapestries MUCK
Using The Smell Command
You can smell another player by typing smell playername
You can smell all of the players in a room by typing smell here
Setting a Scent
You can be notified of when someone smells you by setting the _smell_notify property. This takes a format string that includes normal pronoun substitution. For example:
@set me=_smell_notify:%n just smelled you.