topic and its cross-references

topic

channel [<chan>] topic set <topic>    set topic when alone
channel [<chan>] topic leave          don't (default)
 If set to `topic set <topic>' then whenever I'm alone in the channel
 I'll reset the topic; if se to `topic leave' I'll leave it alone.
channel [<chan>] topic see|tell +|-|= <chan>|* ...
 I can inform one channel about topic changes in another.  Each
 channel has a `see list' and a `tell list' which may be empty or
 contain some channel names and/or a `*'.  I'll tell channel #spy
 whenever I see the topic change in #showoff if: #showoff or * is
 mentioned in #spy's see list, and #spy or * is mentioned in
 #showoff's tell list, and at least one those mentions is not a `*'.
 + adds items to the relevant list, - removes them, and = sets the
 list to exactly those items specified.  Both lists are empty by
 default, but a good permissive value is just `*' for both lists.