## Virtual Device Driver Reference for OS/2

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### Miscellaneous Virtual DevHlp Services

VDHDevBeep Device beep virtual DevHlp service
VDHEnumerateVDMs Run worker function for each DOS session
VDHGetCodePageFont Return information of DOS session code page font
VDHGetError Get error code from last virtual DevHlp service
VDHGetFlags Get DOS Session's EFLAGS Register
VDHHandleFromPID Get handle for given Process ID
VDHHandleFromSGID Get DOS session handle from Screen Group ID
VDHPopup Display message
VDHPutSysValue Set system value
VDHQueryLin Get linear address for Far16 address
VDHQuerySysValue Query system value
VDHRegisterAPI Register API handler
VDHReleaseCodePageFont Release code page font
VDHSetDosDevice Register/install DOS device driver
VDHSetError Set error code
VDHSetFlags Set DOS session flags register