INT 61 - PCIBM PC/TCP(Transmission Control Protocol) A higher level (session layer) of the TCP/IP protocol suite. See also IP, TCP/IP. kernel v2.05+ - "set_option" - SET AN OPTION ON A DESCRIPTOR AH = 20h BX = network descriptor CX = length of buffer (usually 04h) DS:DX -> buffer containing option SI = (ignored by v2.2-) DI = option to set (see #03468) Return: CF clear if successful CF set on error AX = error code (see #03319 at INT 61"FTP(File Transfer Protocol) The standard protocol for copying files from one machine to another on a TCP/IP (Internet) network. Also the program of the same name with which a user may transfer files. Software") Notes: Beame&Whiteside's BWPCTCP shim only supports options 01h and 0Bh; all others return CF clear v2.11 reportedly stores the actual 32-bit value of an option in DS:DX rather than using a buffer in memory SeeAlso: INT 61"FTP(File Transfer Protocol) The standard protocol for copying files from one machine to another on a TCP/IP (Internet) network. Also the program of the same name with which a user may transfer files. Software",INT 61/AH=00h"PCIBM PC/TCP(Transmission Control Protocol) A higher level (session layer) of the TCP/IP protocol suite. See also IP, TCP/IP.",INT 61/AH=21h (Table 03468) Values for PCIBM PC/TCP(Transmission Control Protocol) A higher level (session layer) of the TCP/IP protocol suite. See also IP, TCP/IP. 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(Transmission Control Protocol) A higher level (session layer) of the TCP/IP protocol suite. See also IP, TCP/IP. window or UDP buffer count (WORD, unsigned) 06h do TCP(Transmission Control Protocol) A higher level (session layer) of the TCP/IP protocol suite. See also IP, TCP/IP. keep-alives if non-zero 09h (v2.1+) set IP(Internet Protocol) The lower level (transport layer) of the TCP/IP protocol suite. See also TCP, TCP/IP. precedence 0Ah (v2.1+) set IP(Internet Protocol) The lower level (transport layer) of the TCP/IP protocol suite. See also TCP, TCP/IP. type of service 0Bh use a privileged port if port = 0 0Ch turn off TCP(Transmission Control Protocol) A higher level (session layer) of the TCP/IP protocol suite. See also IP, TCP/IP. PUSH bit and don't flush buffer every write (see AH=1Ah) Note: use "C" true or false values for boolean options