/MARKED [list|clear]
 /MARKED clear
 /MARKED do command

Operates on list of marked buddies.

/marked [list]
 Default action. Lists marked jids.
/marked clear
 Removes marks from all marked buddies.
/marked do command
 Runs specified command for each buddy in list of marked. Command must contain one %s in place, where jid will be inserted. If you need % in other place, use %% instead. No other %-sequences except %% and one %s is allowed.

Examples:
 /marked do say_to -q %s Hello. FYI I will be offline for some days.
 /marked do room invite %s Let's discuss foo.