document.forms is an array of forms
each of them supports: action, encoding, method, name, target, reset(), submit()

document.forms[x].elements: array of inputs

they support things like:
checked, defaultChecked, defaultValue, form, name, type, value
blur(), click(), focus(), handleEvent(), select()

document.forms[x].elements[y].options: array of options in a select
element attributes: length, selectedIndex
per option attrs: selected, text, value