Using the ATTSYNC Command to Update Blocks with Attributes

I stumbled across this AutoCAD command today while looking for a solution to another problem:

"ATTSYNC - Updates block references with new and changed attributes from a specified block definition.

Use this command to update all instances of a block containing attributes that was redefined using the BLOCK or BEDIT commands. ATTSYNC does not change any values assigned to attributes in existing blocks."

I am sure many of have run across this problem: The background has blocks with attributes and you want to get rid of one, or add one. You could use ATTSYNC to update each block with the added attribute or have it remove the extra one. The change can be made by creating a new block (BLOCK command) or by editing the existing one (BEDIT command).

The BEDIT editor is pretty cool. Say, the background drawing has a light fixture, door or window with pieces in seven layers. You can use BEDIT to change all items to one layer. Upon closing the editor, all blocks on the drawing will be updated with the changes. You should check it out.