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 If you canât install the updates, refer to your computer's help system, contact your IT department, or visit support.microsoft.com for assistance. 2  Visit the iTunes download page. 3  Click Download Now to download the iTunes installer.4  When prompted, click Save (instead of Run).earn what to do if you canât install or update iTunes on your Windows PC. If you canât install iTunes on your Windows PC, or if you see âerror 7â or âerror 2â after you install the software, follow the steps below in order.