)
Values network post routine is called with:
	AX = 0000h single block message
	    DS:SI -> ASCIZ originator name
	    DS:DI -> ASCIZ destination name
	    ES:BX -> text header (see #02982)
	AX = 0001h start multiple message block
	    CX = block group ID
	    DS:SI -> ASCIZ originator name
	    DS:DI -> ASCIZ destination name
	AX = 0002h multiple block text
	    CX = block group ID
	    ES:BX -> text header (see #02982)
	AX = 0003h end multiple block message
	    CX = block group ID
	AX = 0004h message aborted due to error
	    CX = block group ID
	AX = 0101h server received badly formatted network request
	    Return: AX = FFFFh (PC LAN will process error)
	AX = 0102h unexpected network error
	    ES:BX -> NCB (see #03249 at INT 5C"NetBIOS")
	AX = 0103h server received INT 24 error
	    other registers as for INT 24, except AH is in BH
	    Return: as below, but only 0000h and FFFFh allowed
Return: AX = response code
	    0000h user post routine processed message
	    0001h PC LAN will process message, but message window not displayed
	    FFFFh PC LAN will process message