Is the name of the table owner. ownername is sysname, with a default of NULL. This parameter is useful to differentiate tables if a database contains multiple tables with the same name, but each table has a different owner.
[ @tablename =] 'tablename'
Is the name of the table that contains the row for which the information is returned. tablename is sysname, with a default of NULL.
[ @rowguid =] rowguid
Is the unique identifier of the row. rowguid is uniqueidentifier, with no default.
[ @show= ] 'show'
Determines the amount of information to return in the result set. show is nvarchar(20) with a default of BOTH. If row, only row version information is returned. If columns, only column version information is returned. If both, both row and column information is returned.