The PLT Help Desk is included with PLT's DrScheme. 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 access the Help Desk, you can
select the menu option Help->Help Desk or
highlight a keyword, right-click, and select Search in Help Desk for keyword.
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