Multiple Turtles Excavating at once over rednet.

I was attempting to activatem multiple turtles all at once over the Rednet, and for the most part I seem to have it close, the only issue I was having, and wondering if it was even possible, was causing each turtle on the network to use the Excavate program at once.

Is this even possible, or do I need a custom lua program to do this?

well if you broadcast the message then it wouldn't be too hard. If you don't know what I'm talking about,tell me and I'll give you an example

I've got some time so I'll give you some code:

For main computer:

rednet.open("enter which side the modem is on here")
rednet.broadcast("START")
rednet.close("enter which side the modem is on here")

For the turtles:

rednet.open("right")
while true do
   senderID, message = rednet.receive()
   if message == "START" then
	  rednet.close("right")
	  shell.run("excavate", "10")
   end
end

I'm a complete newbie to LUA, so how would I go about entering all of this into a turtle? Do I need to use a Floppy, or is it possible to send them the excavate command without needing to program them all?

They gotta be programmed. If you're in SSP, then you can just pause the game, open the save folder and put the file into the subfolder for that turtle's ID (type "id" into the console to find out the id of a computer or turtle). Otherwise, yeah, floppy.

You can make a floppy that has a simple file receiving program, and then transmit text files (including lua programs) to them. Or you can use pastebin (if enabled), though for a program this short that's kinda overkill.