changed:
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this is the pre-multiple-window object for interfacing both window and rendering.

[gemwin] can be emulated by [gemcontrol] + [gemwindow] by a simple trick: all unknown commands to [gemcontrol] are passed to the connectected [gemwindow].

the initial framerate for [gemwin] has to be passed to [gemcontrol].

<img alt="emulating [gemwin]" src="gemwin.gif">