As a service to new Windows users I am revisiting the old post, KB shortcut for Triple click, at
The keyboard shortcuts for single and double clicking in Windows are the number #5 key and the + key on the number pad. If I hover my mouse over a word in the HB, LXX, or NT, and either press the #5 key three times, or press the + key and #5 key in rapid succession with one or two fingers, my preferred lexicon entry comes up.
To enable the shortcuts, go to the Control Panel - Ease of Access Center - Make the Mouse Easier to Use - Turn on Mouse Keys - Set up Mouse Keys. If you can't press the keys fast enough, you can slow down the pointer speed in the control panel.
I hope this helps someone.