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 Visit https://products.office.com/en-us/office-2016-preview. 2  You'll see download links for 32-bit and 64-bit versions of the Office 2016 preview. 3  As above, Microsoft recommends the 32-bit version by default. 4  Make note of the product key on this page, you'll need it to authenticate your install. Click it. 2  On the next screen you'll want to click on Additional install options. 3  In the dropdown box you'll see go ahead and select the Office Preview 32-bit or 64-bit installs as required.