INT 7C - SK-UPPS Data Link Interface API - REGISTER PROTOCOL AX = 0007h ES:BX -> Protocol Control Block (see #03849) Return: AX = completion code (see #03846) Program: SK-UPPS is the Schneider & Koch Universal Portable Protocol Stack, which provides an API on top of its Data Link Interface, allowing the use of any of several network transport layers SeeAlso: AX=0008h,AX=000Bh