Topic Commands
--------------

   When the topic minor mode is turned on, a new `T' submap will be
available.  In addition, a few of the standard keys change their
definitions slightly.

`T n'
     Prompt for a new topic name and create it
     (`gnus-topic-create-topic').

`T m'
     Move the current group to some other topic
     (`gnus-topic-move-group').  This command understands the
     process/prefix convention (see Process/Prefix.).

`T c'
     Copy the current group to some other topic
     (`gnus-topic-copy-group').  This command understands the
     process/prefix convention (see Process/Prefix.).

`T D'
     Remove a group from the current topic (`gnus-topic-remove-group').
     This command understands the process/prefix convention (
see Process/Prefix.).

`T M'
     Move all groups that match some regular expression to a topic
     (`gnus-topic-move-matching').

`T C'
     Copy all groups that match some regular expression to a topic
     (`gnus-topic-copy-matching').

`T #'
     Mark all groups in the current topic with the process mark
     (`gnus-topic-mark-topic').

`T M-#'
     Remove the process mark from all groups in the current topic
     (`gnus-topic-unmark-topic').

`RET'
`SPACE'
     Either select a group or fold a topic (`gnus-topic-select-group').
     When you perform this command on a group, you'll enter the group,
     as usual.  When done on a topic line, the topic will be folded (if
     it was visible) or unfolded (if it was folded already).  So it's
     basically a toggling command on topics.  In addition, if you give
     a numerical prefix, group on that level (and lower) will be
     displayed.

`T TAB'
     "Indent" the current topic so that it becomes a sub-topic of the
     previous topic (`gnus-topic-indent').  If given a prefix,
     "un-indent" the topic instead.

`C-k'
     Kill a group or topic (`gnus-topic-kill-group').

`C-y'
     Yank the previously killed group or topic
     (`gnus-topic-yank-group').  Note that all topics will be yanked
     before all groups.

`T r'
     Rename a topic (`gnus-topic-rename').

`T DEL'
     Delete an empty topic (`gnus-topic-delete').

`A T'
     List all groups that Gnus knows about in a topics-ified way
     (`gnus-topic-list-active').