Hi and thank you for your question.
To view and close all open apps on the iPad, please tap the Home button (at the bottom) two times quickly - this will bring up up a view of all open apps. From there, you may slide UP to close out the apps, one after the other.
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Is the desktop computer running Windows Vista, 7, 8, or 10?
Are you using the desktop computer right now?
Also, can you please tell me what version of Windows is running on that desktop computer? Is it Windows Vista, 7, 8, or 10?
I need to know the version of Windows so that I can provide you the proper and actual steps to close background programs