>I'm using VFP 6.0 on Windows 98
>
>I have no idea when using
>TABLEUPDATE(.T.,.F.) (Default) or
>TABLEUPDATE(.T.,.T.) (With Force clause)
>
>I haven't find any kind of useful information about this.
>Thanks in advance

The force clause tells VFP to overwrite any changes that have been made by other users since the table was opened. If the second parameter is .F., and changes have been made, the TABLEUPDATE will fail, and update conflict will be listed as the reason.