INT 20 - Microsoft Windows - DOSMGR - VxD SERVICES VxD = 0015h 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 SeeAlso: INT 2F/AX=1684h"DEVICE API",INT 30"Windows",#01265,#01340