How to find if computers connected to play LAN?

I am wanting to play a few games (minecraft, Borderlands 2, Saints Row IV, etc) with my girlfriend and none of the games are popping up in the LAN lobby. Now it has worked a few times it is just not constantly available. We are connecting over the wifi because her computer doesn't have the ad hoc networking functionality and we don't have ethernet cables. We are running them as administrators and have made sure firewalls are not causing it. We are definitely on the same network and have no idea why these games aren't recognising that. Your help will be muchly appreciated

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