>Starting first attempt at multi-user.
>
>Is there a function available to determine if other users are sharing a table in a multi-user environment?
>
>I would assume one should first check if the table is opened by other users prior to performing certain table functions, ie; zap
>
>Any assitance would be appreciated.

You really shouldn't zap in a multi-user environment. The idea is to not do anything that requires you to use the table EXCLUSIVE. A good place to start learning about multiuser apps is the Programmer's Guide. Look at chapters 8 and 17.