Can iOS SDK 5.0 be safely installed next to 4.3?

I've been waiting开发者_开发技巧 with installing the iOS 5.0 SDK, because I worry I might not be able to switch to the 4.3 SDK again. Can anyone tell me if it's possible / safe to upgrade to the 5.0 SDK beta and still be able to use the 4.3 SDK for development?

You can install 2 or more xcode versions on the same machine. I would suggest doing this so that you can still submit from a non-beta version to the app store if required.

I've done it lots of times without any problems.