INT 20 - Microsoft Windows - VNBT - VxD SERVICES VxD = 049Bh Note: the desired VxD and service number are identified by the data immediately following the INT 20 instruction, as in: INT 20h DW service number DW VxD identifier (see #02642) SeeAlso: INT 2F/AX=1684h"DEVICE API",INT 30"Windows",#01265,#01340