As you type your word, up to 10 (or as defined in Settings) matches will appear in a drop-down dialog, numbered 1 - 0 (10th). To choose the match you want just hit the associated number on your keyboard (numpad does not work). Alternatively you can select an item from the drop-down using the Up/Down arrows or the mouse. You can define a fixed position for the drop-down dialog to appear by hitting Ctrl-Shift-H to open a small helper window, or by specifying a list of programs in the preferences file. Please note that in Firefox, Thunderbird, and certain other programs you will probably need to open the helper window due to issues detecting the caret position.ettings window.
Comments and Reviews
I personally find this program the most useful when using it with a blank list and using the shortcut keys:
You can permanently learn a word by highlighting a word and hitting Ctrl-Shift-C (this works even if "Learn new words as you type" is set to Off). You may use Ctrl-Shift-Del to remove the currently selected Learned Word.
To add in hard to spell or hard to remember, rarely used words, places, and names.
There are plenty of big word lists available if you prefer a different use case. As a personal tip you can also use WordWeb to generate advanced custom word lists.
If you've ever used auto complete in an IDE that's what this is but for anything else you want to use auto complete for.