NAME
       LockBlitzLibs -- prevent access or modification to the Blitz command
                        libraries in memory

   SYNOPSIS
       success = LockBlitzLibs(accessMode);
       D0                      D0

       BOOL success = LockBlitzLibs(WORD accessMode);

   FUNCTION
       This function, given the appropriate access mode, will lock the Blitz
       command libraries to prevent another task from either :

       a) Accessing them
       b) Modifying them

   INPUTS
       accessMode - a valid access mode. Can be one of either :

                LIBS_ACCESS_EXCLUSIVE
                LIBS_ACCESS_READ

   RESULT
       success - TRUE or FALSE if the lock was successful. FALSE indicates either :

                An EXCLUSIVE lock was present
                A READ lock was present and you requested an EXCLUSIVE lock

   BUGS
       No validation is performed on the accessMode. Therefore, invalid accessModes
       will result in unpredictable behaviour

   SEE ALSO
       UnlockBlitzLibs()