The on-line help:
| <F1> | display the help page for the selected function |
| ctrl-C or ctrl-G | exit the help |
| <up> and <down> | move the cursor bar by lines |
| <page-up> and <page-down> | move the cursor bar by pages |
| <right> or <enter> | follow a link to other help-pages (links are highlighted) |
| <left> or <backspace> | go back to previous help-page |
| ctrl-F | find text: the cursor bar is moved to a line containing the given string |
| ctrl-F | press again to find the next line |
| <enter> | exit the find text function |