-  swish_reply(+Options, +Request)
 - HTTP handler to reply the default SWISH page. Processes the
following parameters:
- code(Code)
 - Use Code as initial code. Code is either an HTTP url or
 
- url(URL)
 - Download code from URL. As 
code(URL), but makes the browser
download the source rather than the server. 
- background(Code)
 - Similar to Code, but not displayed in the editor.
 
- examples(Code)
 - Provide examples. Each example starts with ?- at the beginning
of a line.
 
- q(Query)
 - Use Query as the initial query.
 
- show_beware(Boolean)
 - Control showing the beware limited edition warning.
 
- preserve_state(Boolean)
 - If 
true, save state on unload and restore old state on load.