You would then equip any focus to the turtle, then use the focus in your scripts. For example, equiping the Warding Focus would expose the ward() and unward() functions (along with up and down variants), and the Equal Trade Focus would have the select() and replace() functions (also with up and down variants).
A Vis Turtle could also use Vis as fuel for moving or anything else from other peripherals that uses fuel, like MoarPeripheral's furnace upgrade.
Hopefully, the Turtle could also auto-recharge from near-by nodes, or burns items using the existing fuel system, and then gives the Turtle Vis, similar to the Alchemical Furnace.
Let me know what you think along with how difficult this would be for a mod maker.
Edited by Selim, 27 March 2015 - 09:26 PM.