HP Compaq t5510 Thin Client - Manual (Page 43)

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Getting Started
You can identify hotspots that are currently present in display memory by assigning
the Show Hotspots function to a key + mouse button combination using the Mouse
Button Actions dialog box (refer to the Mouse Functions chapter for details).
Holding down the relevant key and left mouse button will cause all colour attributes
to be temporarily removed from the display and the hotspots will be highlighted with
a red background. Releasing the key and left mouse button will return the display to
its original state.