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.
If it is a click to run version of Office installed on the computer, you may browse to the following location and check if you find Office 15: C:\Program Files\Microsoft Office 15\Root\Office15 I hope the above information helps.f it is a click to run version of Office installed on the computer, you may browse to the following location and check if you find Office 15: C:\Program Files\Microsoft Office 15\Root\Office15. I hope the above information helps. Let us know if you need further assistance.