IOGear GKM541R - Manual (Page 29)

As an example, we will assign the
following functions to the mouse:
Button 3 (scroll wheel) – Enter [this
is the equivalent of a left-click on the
mouse]
Button 4 – Internet Explorer
Forward [this is the equivalent of
pressing the forward button on your
web browser]
Button 5 – Internet Explorer
Backward [this is the equivalent of
pressing the backward button on
your web browser] 5.
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Mouse Configureation