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You can make Google + Desktop Application by using Firefox 5 (Mac, Windows, Linux) by going to webrunner page and installing the Firefox extension followed by restarting your Mozilla Firefox browser.
Mac Users can Make a Google+ Desktop App with Fluid.
first of all Download and install Fluid that is available free for download but you can have extra features if you are buying that only for 4.99 $. How to set up Google + apps desktop application can be learned online in this provided video.
Fluid from Todd Ditchendorf on Vimeo.