The FIELD attribute uses the value of the named field (whereas the FIELD element specifies a field's location), for example:

<TEXT FIELD="Field3" LEFT= "2" TOP="7" WIDTH="1" HEIGHT="1" COLOUR="RED"/>

uses the value of Field3 as its text string.

Note that processing instructions embedded in text may also use field values like this:

Here is <?EE Field3?> in some text

GROUP element example

Fields may be used when setting up criteria for processing "conditional" groups: see Element GROUP.