My computer is an Imac. Not a laptop. I was on a tab on another desktop, I think desktop number 2 when my computer swiped the tab across and i was sent to a new desktop, with all my things saved on the other one, and I am currently using a windows keyboard for it, and the F3 botton is not working, what can I do to find the other desktop without pressing the F3 botton, and using the keys on the windows keyboard?