hab (HAB) - input

Handle to anchor block.

hgc (HGC) - input

Handle to an OpenGL context.

rc (LONG) - returns

The following values may be returned:
• This Context bypasses conventional PM blitting methods, and is faster. < 0
  Error occured.
  1
  This Context uses conventional PM blitting methods, and while it is slower, allows an application to integrate OpenGL rendering and Gpi rendeing commands. See Remarks section.

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