They are using a program called Fairbot.

They are making 4 sets of bets to be done for in-running by pressing the KEEP button . This keeps the bets for in-running.

Faibot can be set to lay the whole field at your set price for the whole field.
Same amount on each.

The 4 price rages he Layed the whole field to lose was 3.20, 2.50, 1.80, 1.50,

What one is hoping for is that 3 or more horses will be picked up at the various price ranges.

Remember only one horse can win

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Cheers.