I've been using tree-style tabs since I've switched back to Firefox. It works really well and I've even disabled the tab-bar and am only using the side panel.
Check out the Factorio Demo. It's free and the biggest Demo I know. You can probably get 10-20 hrs in it alone and if it's fun you can buy the full game for 35 bucks
Their official statement was, that now the GPT versions will only improve in small steps, and no really big releases at a time. This would mean, that they only saved the trademark for later use, so that no one else gets it. But, while this was an official statement, OpenAI is still a company, so they might have made this statement just to appease their competitors.
My guess based on those statements is, that GPT-5 releases around mid of next year, but we'll see.
Not really. You need to use a domain (correct me, if I'm wrong, but I think IP adresses don't work) to connect to the homeserver.
In theory you could setup a DNS server in your nezwork, which resolves this domain with the local adress and then it might work, but I'm not sure if the homeserver would like that.
Also I want to add, that I use TeamSpeak, which works perfectly globally and locally, but it's for voice chat.