)
Values for PC/TCP option to get or set:
 01h	set non-blocking mode if non-zero
 02h	timeout of call in milliseconds
 03h	user-defined 4-byte magic cookie (not used by kernel)
 04h	TCP window or UDP buffer count (WORD, unsigned)
 06h	do TCP keep-alives if non-zero
 09h	(v2.1+) set IP precedence
 0Ah	(v2.1+) set IP type of service
 0Bh	use a privileged port if port = 0
 0Ch	turn off TCP PUSH bit and don't flush buffer every write (see AH=1Ah)
Note:	use "C" true or false values for boolean options