When a booking is being made on a specific item, the fact is recorded in a file named LockSess.tps.

 

I'm making two bookings right now, one in NetBookIt, one in BookIt.  Here's what is in LockSess:

 

The first record with the IP address as User is NetBookIt.  The second record is BookIt.

 

If another user tries to book the same, BookIt checks LockSess and finds that I have priority on those items.

When I close the booking form the relevant record is deleted.

But if I don't close the form, that record stays there, blocking other users.  BookIt should ignore that block after 10 minutes, assuming that I have forgotten to close the window.

 

Cut to the chase, will you!

 

Delete LockSess.tps from the BookIt folder and you won't be blocked.