So I was on a classic server and I found one (http://www.minecraft.net/play.jsp?server=306d2a40ce4e1511253718de2715c7c6) that works pretty well. When you first load it, you spawn in a main area where you aren't allowed to build or do anything. Then, you type a command and it takes you to another world where you can build and do lots of things, but some areas are protected still. How can I do something like this? I have an MCLawl server setup with two worlds, but beyond that I'm clueless.