Format of mode record:
Offset	Size	Description	)
 00h	WORD	16  length of this mode record
 02h  8 BYTEs	(big-endian) mode name
 0Ah	WORD	RU_SIZE high bound
 0Ch	WORD	RU_SIZE low bound
 0Eh	BYTE	mode maximum negotiable session limit
 0Fh	BYTE	pacing size for receive

Routines defined by LU_LU_PASSWORD_EXIT, CREATE_TP_EXIT, and SYSTEM_LOG_EXIT
pointers are called by pushing the DWORD pointer to the verb on the stack and
then performing a FAR call.