>>You can try to open it with USE command with EXCLUSIVE option,
>>and after check the result with ISEXCLUSIVE() function.
>
>But if EXCLUSIVE wasn't successfull then there is no alias to check ISEXCLUSIVE() for.

Not necessarily true. If the table was already open and you try to do a USE yourtable AGAIN ALIAS othername EXCLUSIVE, the USE EXCLUSIVE command works but you DO NOT have the table open exclusively.