I just discovered that SciTE, the programming text editor that I use, has an autocomplete feature that I never knew about.
You turn it on by adding to the properties file:
From then on, if you type a prefix of a word that has only one match within the current file it will suggest that word and you can hit Tab to accept it. This is really handy for long names.
I've seen this feature in other editors but didn't realize it was available in SciTE. (I was aware that there was a facility for setting up API's but this is simpler and more generic.)
Note: SciTE is based on Scintilla which is the code editing component used by Suneido.