The Microsoft Windows Interrupt 2Fh services and notifications help Windows device drivers and related MS-DOS device drivers and terminate-and-stay-resi-dent (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.
Although the Interrupt 2Fh services and notifications are primarily available under 386 enhanced-mode Windows version 3.x, some services are also available in standard-mode Windows.