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.
Client versions. In this section, a client version of Windows is a version that can be purchased and installed on personal computers (desktop computers, laptops and workstations) or purchased with these computers. Windows 10 Home.