This may be equal to the number of slots requested, although it does not necessarily have to be the same value.

Valid slot indicies are in the range of [0, Slots reserved - 1]. Each slot stores state information about a NLS checking operation.

A logon checking session must be finished on the same slot on which it was started. If a logon checking session is abandoned before it is completed, no special action is required. Starting a new logon checking session on a slot overwrites all previous state information. A logon checking session cannot be resumed if the connection to BNLS is interrupted before it is completed.