The maximum number of requests this system can hold in
cfcRequestTable. A value of 0 indicates no configured limit.
This object may be read-only on some systems.
When an attempt is made to create a new entry but the table
is full, the oldest completed entry is bumped out and
cfcRequestsBumped is incremented.
Changing this number does not disturb existing requests that
are not completed and bumps completed requests as necessary.