Gpi drawing intermingled with OpenGL drawing is only allowed on Indirect contexts that use Gpi to blit their OpenGL rendering to the screen. Gpi drawing is not guaranteed to be visible until pglWaitPM has been called. Gpi has no concept of front and back buffers. All Gpi drawing commands are therefore assumed to affect the OpenGL front buffer. pglWaitPM is ignored if there is no current context.