The developers of this software http://www.imgpresents.com/wordcomplete/wordcomplete.htm wanted me to contact the developer over here to ask if Portable Apps supports Windows Active Accessibility. I couldn't get their software to run correctly in the few portable apps that I use (Maxthon Browser & QBittorrent).
Here is what they said: "You may also want to contact PortableApps and see if they support Active Accessibility, which is the interface WordComplete uses to identify the typing caret."
Wordcomplete is typing assistant software, as you type it predicts the next word (based on the characters typed so far) and offers a list of suggestions for the next word. The problem I was having is that the list of words would flash on screen for about half a second and then disappear.