Quick Tips display a suggestion for the word being typed, based on words previously found in the document that begin with the same characters. The first word found, scanning back from the cursor towards the top of the document, is the word that is suggested.
The Quick Tips branch under Configuration - IDE - IntelliTips has the following options:
Show tip "x" ms
This option is set in milliseconds and controls how long an IntelliTip tip will be displayed without user interaction.
Scan back "x" chars (set chars=0 to disable quicktips)
This option is set in characters and controls how many characters back from the current cursor position UEStudio will read to populate the IntelliTip list. This is set to 100,000 characters by default.
Complete with Tab/Enter
This option controls what keys may be used to accept the suggested word (TAB or ENTER).