The *nix X11 gui servers have had long keypress detection on any mouse
button implemented since the beginning. It is used too. There are several
applications that use this and the function can be scripted, and has been
scripted and applied in many applications. The one that immediately comes
to mind is Tcl/Tk where you have access to button events and timestamp.
For people who run *nix, or have tcl/tk installed, type 'man n bind' and
read at the reference to %t.

Peter

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