INT 2A - PCIBM PC/TCP(Transmission Control Protocol) A higher level (session layer) of the TCP/IP protocol suite. See also IP, TCP/IP. PREDIR.EXE - ??? AX = FF94h BX = ??? CX = ??? DX = ??? Return: AX = ??? Note: PREDIR.EXE is the network printer redirector included as part of the PCIBM PC/TCP(Transmission Control Protocol) A higher level (session layer) of the TCP/IP protocol suite. See also IP, TCP/IP. system by 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, Inc.