hdc (HDC) - input

Device context handle.

pInstance (PVOID) - input

Pointer to instance data.

lFunction (ULONG) - input

High-order WORD=flags; low-order WORD=NGreUnlockDevice.

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.