I think yoi need to know the ip and the password in order for you to join.
If you are on a pc, you have to delete "system.32" Then download and install the server software from the website. Next you run the software and the server should be running. Hope that helps :)
I don't know. I've never played Minebuilder.
Unless your server has a whitelist or a blacklist, anyone with the IP address of your server can join it
It is a public server that you can join.
The ip to join a server.
You can join any server, no matter what type of computer you're using. If you mean do you have to have the same mods as a modded server to join, yes, you do.
Mine builder ?
i would
First off, an online server means that the server is up and running. It is available for people to join. An offline server means that the server is down and closed for people who want to join.
To join a game server (if thats what you mean) you have to be a member of xbox live. You must get "Gold". Then you put in a game with an online feature (like Minecraft or Call Of Duty) and join an online server/game.
Cross Join is jsut another Join
To join or "use" a minecraft server you click on Multiplayer (Assuming that you've purchased a premium account). Then click on "Add Server" and enter a name for the server you're adding (This does not matter what you name it, this will not affect if you can join the server or not.) then copy the I.P. address and paste it into the box below the name. Hit add server, then double click to join it.