RAM isn't that difficult to check. The easiest way is to simply open up your Task Manager by executing the Windows key + M or equivalent on a mac, then start investigating each tab when you're in it. Pressing Ctrl-F is typically an easy way of finding when one might want to know more about a specific process and how much RAM it's currently using. Follow the same line and find "available virtual memory".
The other approach would be physically opening up both your laptop and desktop --if who can tell-- and connecting them via an ethernet cable...