Using the wglCopyContext function, you can synchronize the rendering state of two rendering contexts. You can only copy the rendering state between two rendering contexts within the same process. The rendering contexts must be from the same OpenGL implementation. For example, you can always copy a rendering state between two rendering contexts with identical pixel format in the same process.
You can copy the same state information available only with the glPushAttrib function. You cannot copy some state information, such as pixel pack/unpack state, render mode state, select state, and feedback state. When you call wglCopyContext, make sure that the destination rendering context, hglrcDst, is not current to any thread.