What really goes on in a huddle of hurling selectors?

Tipperary selector Johnny Enright, left, and manager Colm Bonnar before the Allianz Hurling League Division 1 Group B match between Tipperary and Kilkenny at FBD Semple Stadium in Thurles, Tipperary. Photo by Brendan Moran/Sportsfile

Selectors and managers. What’s going on in those hurried sideline discussions? What are they talking about at half-time, that small group in bibs at the tunnel entrance? What are they deciding before they hit the dressing-room?

Who’s really making the switches when a championship game is going into the final ten minutes, and how are they decided?