If pglIsIndirect returns 1, it uses Gpi to blit OpenGL rendering. Integration of OpenGL rendering and Gpi renderingis only allowed on Indirect contexts, and is controlled through the use of pglWaitPM and pglWaitGL Applications must call pglGrapFrontBitmap when they need access to the actual bitmap, and call pglReleaseFrontBitmap when they are done with it. The PM Bitmap is not guaranteed to contain any OpenGL rendering until the OpenGL graphics pipeline has been flushed (glFlush, pglSwapBuffers. or pglWaitGL).