What configs of an App can I edit in the several Environments

Hi guys,

Moving from Acceptance to Production, I would like to change some properties of my Application:

1. The name of the Environment, to present a greeting like "Welcome to PRD", "Welcome to ACCPT", etc;
2. The address of some webservices;
3. The number of tweets my application should show (10 in ACCPT and 20 in Production)..

How can I change properties like the above in the various Environments. What is the recommended Mendix approach?