FormElement Return

I just need to understand how the following line returns its values.Code:
Dim Var
For each FormElement in Request.Form

Var = Request.Form(FormElement)

Next
You see say I have 5 form elements on an html form.

Element One
Element Two
Element Three
Element Four
Element Five
I know that it is not checking the names of the elements and producing the results in that order, I know its not running through the Elements top to bottom on the form.

So in what order does FormElement return the values and based on what?