1. Open ur bombus and go to account > edit.
2. Mark there CONFERENCES ONLY and save the account.
3. Now connect, after connect join that room where you want to kidnap user.
4. Now go to add contact > enter user ID in small alphabet > transport nimbuzz.com > name empty > group general > ask subscription Unmark.
5. Now add. The user add with you in hidden.
6. Now go to that ID and click action > invite to conference.
7. Now see! Ur target ID is in room if he/she from symbian.
Note: He/she cant delete you becoz you are not in He/she contact list, you are Hidden.