There are several ways that you can leave Scheme: there are two Scheme procedures that you can call; there are several Edwin commands that you can execute; and there are graphical-interface buttons (and their associated keyboard accelerators) that you can activate.
which will halt the Scheme system, after first requesting confirmation. Any information that was in the environment is lost, so this should not be done lightly.
The second procedure suspends Scheme; when this is done you may later restart where you left off. Unfortunately this is not possible in all operating systems; currently it works under unix versions that support job control (i.e. all of the unix versions for which we distribute Scheme). To suspend Scheme, evaluate
If your system supports suspension, this will cause Scheme to stop, and
you will be returned to the shell. Scheme remains stopped, and can be
continued using the job-control commands of your shell. If your system
doesn’t support suspension, this procedure does nothing. (Calling the
quit procedure is analogous to typing C-z, but it allows
Scheme to respond by typing a prompt when it is unsuspended.)
save-buffers-kill-scheme, normally bound to C-x C-c, and
suspend-scheme, normally bound to C-x C-z. These two commands correspond to the procedures