In the gameofficer

Loot

The master looter's tools: announce, roll and hand out, with history, equity and soft reserves.

In your game: Loot

What it does: When you are the master looter and open a boss's loot, the addon opens a window with the items: you announce, the raid rolls MS, OS or passes, and you hand it out with one click. The Loot tab keeps the History of what was handed out, the Equity (who received how much, against attendance) and the Soft Res imported from softres.it.
Who sees it: The tab is officer-only. The master loot window opens for whoever is the group's master looter. The popup with MS, OS and Pass appears for whoever has the addon and is in the raid.
Where to find it: In the window (J or /gos), Loot tab. The loot system (/roll, Wishlist, DKP or External / Off) and the distribution rules are in Settings › Loot, officer-only. Loot Master is switched on and off in Settings › General › Modules.

The winner is decided in this order: MS beats OS; then the priority set by the officer; then whoever has a soft reserve; then wishlist position; then whoever received fewer items; then the highest attendance in 20+ raids; finally the highest roll. The two criteria before the last come on and can be turned off in Settings › Loot.
Only /roll 1-100 (MS) and /roll 1-99 (OS), from someone in the raid, count. Any other roll is ignored.
The master loot window opens for rare or better items, and for any item that binds when equipped. The rarity threshold is changed in Settings › Loot.
With Min. Attendance for MS Roll above 0, the MS of someone below it becomes OS.
Received fewer items counts what the master looter handed out since the start of the raid session, or in the last 8 hours when there is no session.
If the loot window has already closed, the item stays in the trade queue: when you open a trade with the winner, the addon puts the item in it.
History keeps only what was handed out by the addon's master loot, up to 500 items; the tab shows the 100 most recent.

Pass sends nothing: the master looter does not see who passed.
In Forever, the countdown does not go to the raid warning, and the winner is only announced to the raid when you click End Roll. The game does not let an addon speak in chat on its own.
With External / Off, the addon does not open a loot window or ask for a roll, and the history stops growing.
The loot system applies to your game: each officer picks their own, and the choice does not pass to the others.