Other great resources: Official JS API docs, Scripting Forum
maxPlayers
Defines the maximum number of human/AI player slots on the current map, regardless of whether those slots are filled in the current game.
Notes
Scavenger faction is not a normal player slot as far as Warzone is concerned. For more information, see scavengerPlayer.
Example
Get list of droids for all players
// go through each player in turn and get a list of their droids
for (var i = 0; i < maxPlayers; i++) {
var droids = enumDroid(i); // get droids for player
// do stuff
}