My apartment building has a computer room of 6 desktops and a Laptop. Since these are free to use I wondered if I could mine some small altcoins at night for some spare btc. But I am new to mining(the specifics), I don't know the brand of the computers or their specs but they are around 3 years old. Ive been watching and trading bitcoin for almost a year now so why not utilize idle computing power? Any and all advice is greatly appreciated.