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Special functions :
- double-clic on one item from the left menu (products categories) :
corresponding right submenu activation and mouse auto-swap onto refering list of products first item.
- left/right arrow keys : left/right mouse auto-swap from left menu active item
to corresponding products items in the right submenu, and the other way.
- top/bottom arrow keys : vertical looped mouse auto-swap
from an item to an other in the left or right active menu.
- enter key : when the right submenu is active, adds or removes
one target product item, depending on selected tool ((+) ou (-)) and if possible.
- shift key held down : allows to temporarily alternate (+) tool (constant add tool)
with (-) tool (products removal), if possible.
- add or remove products quantities directly in the bill summary statement,
depending on selected tool ((+) ou (-)).
- shift key held down and click on a bill in the list : depending on current user identification level,
"at the surface" removal (hidden to level 1 and 2 users) or definitive removal (for level 3 users) of the bill.
- add or remove instructions in the "history" window, depending on selected tool ((+) ou (-)) and if possible.
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