I have 3 laptops running LMDE 64-bit in my home, and a slow internet connection. What is the handiest way to download files once and update all three? I have been using AptOnCD. This works well but requires some regular manual work, and does not cover 100% of downloads as the three laptops might have slightly different software packages installed. Is there some way to configure the APT-system to work through a proxy, so that I could designate one laptop to connect to the internet, and the other two to connect to it over WLAN?