First of all I must say, that i never tested the following, but this is raw from the documentation.

If you look at the description of <ClickMouseButton Stroke Target Mode Restore>there is a Mode 'Dupe' described like this:
Dupe
Clicked cursor's coordinates are the same as coordinates of cursor on machine where hotkey is pressed. If target is Screen, the coordinates are relative to the screen; if target is Window, the coordinates are relative to the window.
So I would guess that this in combiation with using Window as the target should work.

So I would try something like:

<ClickMouse LButton Dupe>

EDit:
so a complete Hotkey would look like this:
<HotKey xxxx>
<SendPC 192.168.1.x>
<ClickMouse LButton Dupe>