NFL adds tablet computers, secure wireless networks to assist players, coaches and officials during games [...] Kaepernick and other NFL players will be using a new digital photo system that could eventually replace the league's decades-old method of studying opponents from the sidelines using printed black-and-white photos. The Sideline Viewing System, developed as part of a reported $400 million partnership between the NFL and Microsoft, is one of the on-field technologies the league is introducing this year. New technologyWhen the regular season starts, Microsoft's Xbox Live network will offer services that include video feeds of game highlights and fantasy football data. Xbox owners will also gain access to NFL Sunday Ticket, the league's package of out-of-market game telecasts that was previously available only to DirecTV satellite service subscribers. Officiating crews will have their own wireless communications network so they can confer on penalty calls without having to huddle, or one having to run yards downfield to talk to another. "Working with Zebra will give fans, teams, coaches and players a deeper look into the game they love," Vishal Shah, NFL vice president of media strategy, said in a news release.