Yes, you can install and activate Creative Cloud desktop applications on two computers, regardless of operating system, for the individual associated with the Creative Cloud membership.
Please refer to http://www.adobe.com/products/creativecloud/faq.html#getting-started for more details.
Creative Cloud is platform independent and works on the basis of your Adobe Id & Password . So , you can install Creaitve cloud product on both MAC & Windows and activate the same using your Adobe Id & Password.
Yes, you can activate Cloud apps on a maximum of two computers simultaneously regardless of operating system.
Note there is no activation code or serial number. Just sign in/sign out.