It allows anyone in your game to move tokens.
The games I run, we use ditzie for maps and google docs for record keeping. As the GM, I put up the AC/F/R/W the players need to hit, so they can fluff their posts knowing if they hit or not. ditzie allows them to push / pull / swap with / etc both their own tokens and the baddies.
An example of a ditzie map (my players are up to their armpits in hill giants atm) is here: Against the Giants mP
Feel free to move / play with things.
The beauty of this of course is that if it is midnight where you are, and 10 hours earlier where you players are, they don't need to ask you if they hit, as they know what they need, and they can move / slide / push / pull the baddies for when you get up.
Ooh ... and both systems are free ... I'd happily pay for ditzie though