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The field status specifies whether the field has been edited. It is
initially #f
and when the user enters something and the data
buffer gets modified, it becomes #t
. So a field’s status can
be queried to find out if it has been modified or not.
The two procedures that work with field status are
set-field-status!
and field-status?
. The procedure
field-status?
returns the current state, and
set-field-status!
can be used to set the state.