It would work for lan gaming since you are within your network, but not for Steam since Steam essentially is a form of DRM and you'll need to "check in" eventually. I know Steamworks is their actual DRM library and that developers can decide if they want to use it or not, but Steam essentially made DRM flourish in the industry. As much as I love Valve and the games they've made early on, they definitely have hurt the industry in this respect.