Last night I was running Chauvet ShowXpress software on my Surface pro 3. Show Express is software to control DMX lighting fixures . My husband runs a high-end mobile disco and all his lights are computer controlled. Usually we use a Asus touchscreen laptop for this purpose but last night, as I was just setting up some new programs for some new lighting fixtures I ran the software from my surface. It's so brilliant that I have the freedom to do this. You can also control the software via an iOS or android app, but it requires a PC or Mac running the REAL software to be present. So I had him using his android tablet and phone controlling the lights via my SP3.. I'm sure some here run some unusual applications on their Surface.. What do YOU use YOURS for?