Hi Dave,

>I would assume one should first check if the table is opened by other users prior to performing certain table functions, ie; zap

It is impossiable to ZAP or PACK a table unless it is opened EXCLUSIVEly, and if you have the file open EXCLUSIVEly you can be sure no one else has it open at all. Some thoughts, ZAP and PACK are very dangerous commands, if your new to multi user click on this link: Data Buffering ,its by John Koziol, I think