Development tools : Global Configuration : Enabling Tooltip and Document display
  
Enabling Tooltip and Document display
You can enable tooltips and a short cut to display documents in the XUI editor and Transaction editor.
If you enable Tooltips, you can see information about an element when you hover over the element in the Editing area of the XUI editor or Transaction editor, You also set the shortcut for Document display. By default, it is set Ctrl+T.
1 Open Window > Preferences > UDTT > XUI Editor or Transaction editor.
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2 Select Enable Tooltip and Enable Document.
3 In Document Key, enter the shortcut that you want to use to display a document.
4 Click OK.
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