About Windows Interrupt 2Fh Interface

The Microsoft® Windows® Interrupt 2Fh services and notifications help Windows device drivers and related MS-DOS device drivers and terminate-and-stay-resident (TSR) programs manage their operations in the multitasking environment of Windows. The services let drivers carry out actions such as relinquishing the CPU time slice. The notifications let drivers respond to events, such as starting up Windows, that Windows broadcasts using Interrupt 2Fh.