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AH = 40h BX = handle for character device "$IPCUST" CX = number of bytes to write DS:DX -> buffer for configuration data (AH=3Fh"IPCUST")
Return:
CF clear if successful AX = number of bytes actually written CF set on error AX = error code (05h,06h) (see #01680 at AH=59h/BX=0000h)
Notes: If less than the entire data is read or written, the next read/write continues where the previous one ended; IOCTL calls AX=4402h and AX=4403h both reset the location at which the next operation starts to zero. The data pointer is also reset to zero if the previous read or write reached or exceeded the end of the data, when the current function is read and the previous was write, or vice versa. V2.1+ uses a new configuration method, but allows the installation of IPCUST.SYS for backward compatibility with other software which must read the PC/TCP configuration
See Also: AH=3Fh"IPCUST" - AX=4402h"IPCUST"
Category: Network - Int 21h - P
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