No, such a list is not stored by minecraft.
Only the most recent server visited is saved, in options.txt in the .minecraft directory.
No, multiplayer has no effect on your already existing single player worlds.
LAN world
Yes, I am pretty sure that you can. You need a Minecraft or website account to play the demo I think, if you didn't know that already. Hope this helped! :)
To create a username, first register a Mojang account. After you are logged in, you can purchase Minecraft. At this point, a green box will appear on your Mojang profile, prompting you to choose a new username, or import a previously-registered one. If the name you have chosen already exists, you will need to try a different name.Make sure that you choose wisely; it will be used for your single/multiplayer games. You may not be able to change it so choose carefully.
When is Minecraft coming out on disc
they already bought minecraft.
It Already is
its already out
If you have already purchased Minecraft PE, then update the game.
simply by joining a server already made by someone else. look up server that interest you and place their ip(sometimes a link) in the ip address bar when adding a server.
It already came out.The multiplayer is also out.
You can already make portals in Minecraft for Xbox and PC. In the new app they should already have them too.