It is possible to apply some operations to a number of tasks at once.
You can move several tasks to another list by simple drag-n-dropping them.
1. Assigning—it is possible to re-assign tasks from the same Project or Area only. They be assigned only to members of the selected project/area (see Sharing Projects and Areas section). Special “me” value is supported.
4. Watch/Unwatch. If you are not in Watchers list of at least one of the selected tasks, then Watch button will be displayed. If you already Watch all tasks, then Unwatch button will be displayed.
All other actions, including deletion and completion, cannot be applied for a number of tasks at once.