## Virtual Device Driver Reference for OS/2

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### BIOS INT 05h Emulation

The method used to send data from the display to the printer (LPT1) is to press the Print Screen key. DOS applications can also initiate a Print Screen function by issuing a call to a BIOS INT 05h function. The virtual parallel port device driver passes this request to BIOS for processing. The virtual device driver performs some special processing to prevent the INT 05h request from intermixing with an INT 17h print request to the same device. Also, two BIOS INT 05h requests cannot be performed simultaneously from within the same DOS session. The second print screen request is ignored.