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.
Here's how to check the BIOS version with Microsoft System Information: 1  In Windows 10 and Windows 8.1, right-click or tap-and-hold on the Start button and then choose Run. 2  In the Run window or search box, type the following exactly as shown: msinfo32 A window titled System Information will appear on the screen.