[soltakss]

What do people think about Gates between worlds or between parts of a world?

If you have gates that connect worlds, what's to stop people invading one world from another?

Are gates magical/technologically difficult/controlled by a superior force? Is it difficult to use gates? Are they only suitable for small numbers of people to use?

Do you see the gates as something like Stargate, something like the magical pools that connect Narnia with other worlds, the magical portals of the Slipstrasse (sp?) or something entirely different?

Although gates are a staple of many Fantasy/SciFi/SciFantasy stories, I'm not sure how much use they would be if they were easy to use and common.