Synopsis:
$ currchans ([<server refnum>])
Technical:
Returns the current channels for each window connected to <server refnum>.
If <server refnum> is -1, then $lastserver() is assumed. If no arguments
are passed, all current channels are returned. This function returns
each argument as "<server refnum> <channel>" in double quotes.
Examples:
eval echo $currchans(1) /* returns "1 #epic" "1 #unix" */
(assuming there are two windows connected to server 1, with #epic in
one window and #unix in the other)
