hdc (HDC) - input

Any device context handle.

pdcArg (PDC) - input

Pointer to instance data.

FunN (ULONG) - input

High-order word=Flags; Low-order word=NGreOpenScreenChangeArea.

rc (LONG) - returns

This function returns one of the following:

hsca

The handle of the new screen change area (SCA).
GPI_ERROR
There was no memory available. The memory allocation failure will have been logged by the memory allocation routine.
Possible Errors Detected: When an error is detected, the handling routine must call WinSetErrorInfo to post the condition. Error codes for conditions that the handling routine is expected to check include:

PMERR_INV_HDC PMERR_MEMORY_ALLOCATION_ERR

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