The ARexx scripts HuntDoc for AmisED and CygnusED 3.5 are usefull for programmers: they will display the AmigaGuide autodoc of a specific function on a key press (if you configure your editor to do so).
I don't know of any other similar script for AmisED.
This isn't the best one for CEd, since I did not spend much time translating it from AmisED. It's OK but will not work for function names containing an underscore, for example (under AmisED this works).
Have a look at the readme for requirements/changes : Amis_HuntDoc.readme