User blog comment:Koggeh/The Koggeh Challenge EXTREME/@comment-4697378-20120118145201/@comment-4697378-20120119011540

Open Terrariaserver.exe which should be in folder where you installed Terraria. Select server/world to work with. After some loading and some question, you'll get black screen where is written sth like this:

Listening to port 7777 Type 'help' for a list of commands.

Write help and press Enter. You'll get some extra commands which you can use in this window and it will affect world you chosen on beginning. I think it won't reset your world, at least it didn't do that to me.

Alse, when you're over and want to close server/world, you must type 'exit' so changes on world can be saved. If you just press X button, any changes you done on your world after openning it with Terrariaserver.exe won't be saved and it will be same as you didn't do anything.

And I think that if you gather for example 250 wood on that server, it won't be erased from your inventory.