When you have been assigned a task on an item's Tasks tab, that item will be listed on the Item Explorer's Tasks tab. Similarly, when you check out a file for modification, that file's container item will be listed on the Item Explorer's Files tab.
Assigned Tasks: Open the item to view and complete the task.
Checked-out Files: Open the item to view the checked-out file. You can then check the modified file back into the library, or to release the file lock so others can check out the file.
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