"A structure is just an array..."
Structures and arrays are not the same thing:
* An array is a collection of items all of the same type;
* The elements of an array are accessed by index;
* A structure is a collection of items of (possibly) different types;
* The elements of a structure are accessed by name

"Typedef the structure."
This is not necessary: A definition of the form

struct A {
  <member list>
};

Defines 'A' as a structure type

"/* Declare the structure. Sets aside memory */ 
TParam Parameter;"

Note that this is a definition of the identifier Parameter - not a declaration

See also:
http://www.keil.com/discuss/m...MsgID=2585