INT 21 U - Trusted Access - NB.SYS - SET STATE
        AH = 40h
        BX = handle for character device "$$NB$$NB"
        DS:DX -> state record (see AH=3Fh"NB.SYS")
        CX ignored
Return: CF clear if successful
            AX = number of bytes actually written
        CF set on error
            AX = error code (05h,06h) (see AH=59h)
Program: Trusted Access is a security and access-control package by Lassen
          Software, Inc.; NB.SYS is a device driver to prevent the user from
          terminating CONFIG.SYS or AUTOEXEC.BAT with Ctrl-Break
SeeAlso: AH=3Fh"NB.SYS"

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