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+ - "net_select" - DETECT READINESS OF NETWORK
	AH = 0Eh
	BX = maximum value of network descriptor for which to return info
	DS:DX -> 32-bit (max) array of bit flags for read readiness
	ES:DI -> 32-bit (max) array of bit flags for write readiness
Return: CF clear
InstallCheck:	test for the signature "TCPTSR" three bytes beyond the start
	  of the interrupt handler
Range:	INT 20 to INT E0, selected by configuration
Notes:	bits in the DS:DX buffer are set if the corresponding network
	  descriptor may be read without blocking; bits in the ES:DI buffer
	  are set if the corresponding network descriptor may be written
	  without blocking.  This implies that the network descriptor has
	  opened correctly and the protocol initialized.
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."