The Supplemental draft often comes and goes without much press or fan attention, this is due to the fact that most of the players who enter the supplemental draft aren't worth spending a draft pick on and if they make it through the draft without being claimed, they become undrafted free agents, free to sign with any team they like.
The draft works like an auction, there are no running clocks, no trades and no red carpet in New York (or Chicago). However if you want to take a player you simply contact the league office with the round you'd like to take him in.
If you put a claim on a player with a draft pick, you lose that draft pick in the following years main draft. So if the Jets put a 4th round claim on someone like Isaiah Battle and they are rewarded his rights, the Jets will lose their 4th round selection in the 2016 NFL draft.
It works largely in the same way the draft order is worked. However there are three different pots for teams.
Teams who won 6 or fewer games are placed into pot 1.
Teams who didn't make the playoffs are in pot 2
Teams who made the playoffs are in pot 3
If two teams from the same pot put the same claim (say a 4th round selection) on the same player, the team with the worst W-L record is awarded the player. However say a team is 9-6 but they miss out on the playoffs, if they stake the same claim as an 8-8 team who did make the play-offs, the 9-6 team is awarded the player, and that's how it's slightly different to the main NFL draft.
The supplemental draft came into effect in 1977 and since that date, 42 players have been selected, including 8 pro bowlers and one hall of famer (Chris Carter).
The New York Jets have only ever been awarded one player in the supplemental draft in their history. They spent a 1st round selection on future Pro Bowler Rob Moore, a player who would go on to record 628 receptions for 9,368 and 49 touchdowns.
Isaiah Battle will definitely be selected but there are a number of other players who could warrant a selection as well, including the likes of West Georgia due, DT Dalvon Stuckey and DE Darrius Caldwell.
If you have any questions about the draft, pop them in the comments below and we'll do our best to answer them.