JLCooper MCS3 USB - Manual (Page 19)

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To Make the Key Send a Mouse Click
If you chose to assign a key to send either a left or a right
mouse click, the click can take place in a specific location
within a window.
Alternately, the click can be unspecific, that is, the click can
occur wherever the pointer happens to be located.
To Make a Key to Send a Simple Mouse Click:
Select a key by pressing the key.
Select Left or Right Click from the Mouse Emulation menu.
The click will occur within the target application, anywhere the
pointer is located.