The commands:

	Esc-o (M-x xscheme-send-buffer)
	Esc-C-z (M-x xscheme-send-region)

Don't work for R3RS scheme or 6.001 scheme.  To evaluate an entrier buffer
save the buffer into a file and do:

	(load "filename")

in the *scheme* buffer.  To evaluate a region, save the region into a file
with:

	M-x write-region 

and then do:

	(load "filename")

in the *scheme* buffer.