someone please correct me if im wrong, i think BATTMAN updates changes to attributes in blocks. So say you have block named roomname and that block initially had 3 attributes. Now halfway through working on the dwg you decide you need to add one more attribute to the roomname block. You would go into block editor and make the changes to add the attribute. When you save and close out of block editor you should notice all your old roomname blocks look the same but if you insert a new roomname block it will have 4 attributes instead of 3, by using BATTMAN it will update all your old roomname blocks to have 4 attributes instead of 3. you can do the same with ATTSYNC.