You are currently in the TWiki web. The color code for this web is this background, so you know where you are.
If you are not familiar with the RHUL Physics Department TWiki collaboration platform, please visit WelcomeGuest first.
The description above briefly explains how a background color corresponds to a particular web. It can be included within other topics using the following directive: %INCLUDE{"%SYSTEMWEB%.YouAreHere"}%