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President Barack Obama and Republican challenger Mitt Romney will take to the stage Monday night for their final debate before the Nov. 6 election, and ABC7 News and React Labs are teaming up for our final installment of Instant Reaction of debate season.

Using the Instant Reaction mobile app, you can interact with what the candidates are saying in real time on your smartphone and watch the reactions of every participant on a chart on WJLA.com.

Instant Reaction is a three-screen experience - we want you to watch the debate at 9 p.m. on ABC7, vote in our poll using your smartphone and watch everyone's reactions on your home computer. Here's how to get involved:

1) HOW TO REACT ON YOUR PHONE: Using your iPhone, iPad or Android device (or compatible browser), log on to www.wjla.com/react. Answer a few short questions, then tap Agree, Disagree, Spin and Dodge while you watch the debate.

2) TO WATCH THE REACTIONS FROM YOUR COMPUTER: From your computer, log on to www.wjla.com/chart using Google Chrome, Firefox or Safari (Internet Explorer is not supported). From there, you can watch the real-time reactions of every Instant Reaction participant.

3) Once the debate starts, react as much as you'd like! You can agree or disagree with the candidates, indicate that they're spinning or cry out that they're dodging questions.

One day out from their last debate, Republican Mitt Romney and President Barack Obama are cramming foreign policy and taking a rare break from swing-state campaigning.

Monday's face-off in Boca Raton, Fla., represents one of the last major opportunities for Obama and Romney to capture the attention of millions of voters — especially that small but sought-after group of voters who haven't yet made up their minds.

Obama was holed up in Camp David in Maryland's Catoctin Mountains, where he arrived Friday to prep for the debate, a 90-minute encounter focused on international affairs. With him at the presidential retreat were a band of top advisers including National Security Adviser Tom Donilon, campaign strategist David Axelrod and White House senior adviser David Plouffe.

Romney planned to spend the weekend in Florida, continuing intensive preparation that has consumed large amounts of his time in recent weeks. Read all about the third debate here.

Click here to check out how all of our participants reacted to the second Obama/Romney debate!

The Associated Press contributed to this report.