## Virtual Device Driver Reference for OS/2

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### Virtual Interrupt Services

VDHClearVIRR Clear virtual IRR
VDHCloseVIRQ Deregister IRQ handler
VDHOpenVIRQ Register IRQ handler
VDHQueryVIRQ Query IRQ status on a DOS session
VDHSendVEOI Send virtual EOI to VPIC
VDHSetVIRR Set virtual interrupt request register (IRR)
VDHWaitVIRRs Wait until interrupt is simulated
VDHWakeVIRRs Wake up DOS session