You could probably use a tool like SPLASHTOP to extend your PC's desktop over onto the Mac.
(There are various apps that work like Splashtop. I just happen to use this app, so it's the one I have some experience with.)
The way it works is this...
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You run a "streaming" app on your main computer. In your case, on your pc. This will "stream" your computer's desktop to a suitable receiver.
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On your target machine, for instance, a Macbook, or Android tablet, or another Windows machine, you run a second app, which "receives" the stream from the host computer. The target machine effectively becomes a second monitor, displaying either a duplicate of the host machine's desktop, or an extension of that desktop. This depends on the settings you choose in the host machine's streaming app.
