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.
When the update is complete, select Yes to restart your computer. If Internet Explorer is installed on your system, first determine the version that you have: 1. Start Internet Explorer. 2. From the top of the browser tool bar select Help.3. From the drop down panel select About Internet Explorer. 4. A window will appear displaying the version number.tart your internet browser and go to the URL: http://www.microsoft.com/windows/ie/ 3. Click the blue Download Now button. On the next page click the gray Download Now button. 4. Save the file ie5setup.exe to your Desktop. (At the time of this writing, Internet Explorer 5.5 was the latest version).