The command "TURNORACTION" is a wow function that is normally bound to the mouse right button. So what the first post says to do is bind a key (in the example he uses L) to "TURNORACTION" then you can press that key to loot.

If you use one monitor with the clones stacked up behind then you put the clones in first person view so pressing the keybind will almost always loot/interact.

If you run all your accounts on one machine with multiple monitors (like I do) then you move the mouse over to the screen you want to loot/interact (or npc interact) with. When you mouse over objects you see the tooltips like you normally would and just hit the keybind to loot/interact. The bonus is you never lose focus on your main WOW so you simple move the mouse back to the main screen and keep going.

An alternate method of keybinding is to edit the macro file directly. I.e. enter this line "Bind L TURNORACTION" or whatever key combo you want.