A checkbox is a labeled, square box used to invoke a function
(or set of functions) whose argument is the value of the
checkbox. To toggle (check or uncheck) a checkbox, click on the
checkbox (or label). Checkboxes can also be grouped to invoke
functions whose argument is the cumulative value of all checked
boxes (logical ORing). Boxes that have the same groupName are
considered part of a checkbox group. Within a checkbox group,
any combination of boxes can be checked. If none of the boxes
are set within a group, then 0x00 is the href function call
argument. Therefore, you must give each box a checked value that
is different on a binary bit level. If one box has a checked
value of 0x01, then another box could have a value of 0x02, and
the next a value of 0x04 (not 0x03 because that would be the
ORed value of boxes 1 and 2 when checked). Parameter="invisible"
value="CHECKED" or "UNCHECKED" — Specifies if the Check Box is
to start out invisible or not. If the attribute is not CHECKED,
then by default the Check