Io N00B - basic questions

HI all,

I've read most of the docs on Io, but am still unclear about these two
items:


What's the difference really between

*::=*

and

*:=*

The ' := ' is obvious, ' ::= ' not so.


And what's the difference between the coroutine syntax of

*@*thing

and

*@@*thing


thank you for the assistance,


GO IO !