## Presentation Device Driver Reference for OS/2

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### GreUnlockDevice Return Value - rc

rc (BOOL) - returns Return codes.

On completion, the handling routine must return a BOOLEAN value to indicate success or an error.

TRUE Successful
FALSE Error

Possible Errors Detected: When an error is detected, the handling routine must call WinSetErrorInfo to post the condition. An error code for conditions that the handling routine is expected to check is:

PMERR_DEV_FUNC_NOT_INSTALLED

Refer to the "Error Explanations" section in the Presentation Manager Programming Reference for further explanation.