There are two way to check.first is you can directly check whether key contain A or not in binding like this:-. but i think this is not the better way so instead of this you can use ko.computed to check.
Check for operating system information in Windows 7. 1  Click the Start button , enter Computer in the search box, right-click Computer, and then click Properties. 2  Look under Windows edition for the version and edition of Windows that your PC is running.
1 In the Setup window, click Install Now. 2  Click Go online to obtain the latest updates for installation (recommended) . 3  Type the CD or DVD key if you are prompted to do this. 4  On the Install Windows page, select the operating system if you want to upgrade.5  Click Yes to accept the Microsoft Software License Terms.f Windows Update freezes during download, use the following method. If this method doesn't resolve your issue, go to method 3. Fix it for me. To fix this problem automatically, click Fix it, click Run In the File Download dialog box, and then follow the steps in the Fix it wizard.