Functions which load code at runtime require a symbol specifying the
module name to use.
| load | (filename|<str> modname|<sym> => <any>) | G | 
|  | returns the result of evaluating the result of reading file
  named filename into module modname. |  | 
| eval | (x|<any> modname|<sym> => <any>) | G | 
|  | return's result of evaluating x. |  | 
| top | (modname|<sym>) | G | 
|  | runs top-level read-eval-print loop which reads from 
  in and writes to out. |  | 
| save-image | (filename|<str>) | G | 
|  | saves an image of the current GOO process to a file 
       named filename. |  | 
| $ $$ $$$ | <any> | I | 
|  | refers respectively to last, second to last, and third to last
       values returned in top-level listener. |  | 
|  |