The PLT Help Desk is an application included with PLT's DrScheme which allows users to navigate through a great deal of Scheme information. It is "a complete source of information about PLT software, including DrScheme, MzScheme, and MrEd."
It also provides a great deal of general Scheme information, the text of many SRFIs, the FixnumDays tutorial, and syntax/grammar of R5RS.
To launch Help Desk, you can
start it from the command line by typing help-desk,
select the menu option Help->Help Desk, or
highlight a keyword, right-click, and select Search in Help Desk for keyword.