The best way to lookup Scheme symbols and read about them is with InfoMode and InfoLook. This is setup in Emacs by default. In Scheme Mode buffers, typing
‘C-h S’ will search in the index Revised5 Report on Schema Programing (R5RS) for the the symbol at point. You just need to install the R5RS info file into your InfoPath.
Scheme-lookup was a modified version of
hyperspec.el (see CommonLispHyperspec), seeded with symbols from R5RS, finalized SRFIs and the manuals of several Scheme systems. It allows to simply put the TextCursor over a symbol and hit M-x scheme-lookup to jump to the relevant documentation.
To get scheme-lookup do
darcs get http://twb.ath.cx/~twb/canon/scheme-lookup/
then follow the instructions at the top of scheme-lookup.el. It should all be pretty self-explanatory.
(But that site has been dead since 2009-10-31).