When ever you hover your mouse over a native function, user defined function, or an AutoItObject method then you will see the calltip for that function.
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To use this just place the following folder into the "...\AutoIt3\SciTE\lua\" directory. May require administrative rights.
MouseHoverCallTipsPlugin.zip
downloads: 1319
After you have done that then open SciTE and select from the menu bar at the top:
"Options" then "Open L