Extending Existing API's

So, I'm gonna extend some already existing API's, and add neat features such as rednet.openAll() I can't do:

function rednet.openAll()
  ...
end

and I can't do:

rednet = {}
rednet.openAll()
  ...
end

The first one attempts to write to a global API, which is not allowed, and the second one, of course, would wipe out rednet. Does anyone know if it is possible to extend APIs? Thanks.

This should work:

rednet.openAll = function()
  -- body
end

Your first method should work just fine.

bios:267: Attempt to write to global

Btw I'm doing this on tekkit.

ok then

rawset(rednet,"openAll",function()
--
end)

Orwell's method should work fine.