INT 69 - DECnet DOS CTERM - OPEN SESSION                                        
	AX = 0105h
	DS:BX -> ASCIZA NUL-terminated ASCII string.	The ASCIZ string "ABC" consists of the four bytes 41h, 42h, 43h, and 00h.  Unless otherwise specified, maximum lengths given in the interrupt list do not include the terminating NUL. node name
	ES:DX -> buffer for session control block (see #03727 at INT 6A/AH=D0h)
Return: AX <= 0 on error
	AX > 0 session handle
SeeAlso: AX=0103h,AX=0106h,AX=010Ah