When you talk on a channel without using the ';' command, the
mud has to search through all available channels to see which
one you meant.  If there is more than one that starts with the
name you specified, then the mud reports an ambiguity.

However, if the smartresolve option is set, then the search
is restricted to those channels that you talked on most recently.
The result is that the mud doesn't complain nearly as much about
which channel you want to talk on.

See also: channels