Format of APPC/PC "TP Started" control block:
Offset	Size	Description	)
 00h 12 BYTEs	reserved
 0Ch	WORD	2400h (verb "TP Started")
 0Eh  6 BYTEs	00h
 14h	DWORD	(big-endian) return code (see #03668)
 18h	WORD	00h
 1Ah  8 BYTEs	(big-endian) logical unit ID
 22h  8 BYTEs	(big-endian) TP ID