A task goes through stages as different actions occur. Here is a list of actions you can take before completing a task, and what happens when you do:
Claim
You can claim a task to start it. When you claim a task, it is not available for other users to work on and they cannot see it. When you claim a task, all of the task work options are enabled, as described in
Working with a Task, Attachments, and Comments.
Note:
If you are the only person that a task is sent to, the task is automatically marked Claimed, and you can begin working on it.
If you claim a task, you can release it, meaning you will not finish working on it. The task returns to unclaimed status and any user in the group can claim it. The task reappears in other users' task list when they refresh their view.
Set Priority
You can change the priority of a task after you claim it. The highest priority is zero. You can assign any non-negative number (0, 1, 2, and so forth) to lower or raise the priority. The Set Priority feature is in the Additional Information section at the bottom of a task in the Detail tab. Select the link on Priority to open the