Help for /block

Usage:  /block [thing[,thing,...]]

If you should get sick of seeing a user or discussion in your who or what lists 
use the /block command to filter them out. To filter out pa and wank try "/block
wank,pa"; they will no longer appear when you type /what. The same holds true 
for a user. To eliminate Achorrath from your /who and /idle lists try "/block 
ach".

To see a list of everything you have blocked simply type "/block".

For information on removing a block, type "/help unblock".

Note: This only affects the object's presence in lists. You can still send and 
receive messages with that object. If you combine a "/block object" with a 
"/notify all object off" and a "/ignore object all", lily will completely remove
a thing from your sight.

(see also: who, what, unblock)