Most of DAN's operating parameters can be set via a form.  Within a
form the following keys are usually available:

TO SELECT A FIELD
-----------------
  cursor Up,Down    Move up or down one field.  Both keys wrap around
                    to the first or last fields.  Active field will be
                    highlighted.
  Ctrl-cursor Right Move to field to the right of the current field.
  Ctrl-cursor Left  Move to field to the left of the current field.
  Ctrl-Home         Move to first field on current form.
  Ctrl-End          Move to last field on current form.

MOVEMENT WITHIN A FIELD
-----------------------
  cursor Right,Left Move one character to the right or left.
  Home              Move to first character of field
  End               Move to character at end of field
+
MODIFYING FIELD VALUES
----------------------
  Normally, you type in a new value and hit `Enter' to indicate you
  are done modifying the field value.  However, you can also use the
  following keys:
  Ins               Toggles between insert and overtype mode.  Insert
                    mode is indicated by  a highlighted `insert' in the
                    upper right corner of the screen.  Insert mode causes
                    characters to be inserted in the field to the left of
                    the current cursor position.  Overtype mode causes
                    typed characters to replace the character under the
                    cursor.
  Del               Deletes the character under the cursor.
  BkSp              Deletes the character to the left of the cursor.
  F5                Resets the current field to 0 for numeric fields
                    or blanks for text fields.
  F7, F8            Decrement (F7) or increment (F8) the field value by
                    1 for numeric fields, or move backward or forward
                    through the possible choices for a CHOICE field.
+
MODIFYING FIELD VALUES
----------------------
  F9                Toggle YES/NO fields.  That is, convert a YES value
                    to NO and convert a NO value to YES.  YES/NO fields
                    are indicated by a `?' character in the field label.
  F10               Display possible choices for a CHOICE field.  Use
                    the cursor keys to highlight the desired choice and
                    hit either `F10' or `Enter' to select that choice.
                    Alternatively, type several leading characters from
                    the name (enough to uniquely identify the choice), and
                    then hit `Enter'.  Usually, just the first character
                    of the choice name is sufficient to select that value.
+
TERMINATING FIELD MODIFICATIONS
-------------------------------
  Enter             Truncates all characters to the right of the cursor
                    position and enters the new value.
  cursor Up, Down   Leaves characters to the right of the cursor position
                    alone and moves to the next field up or down from
                    the current field.  Use this method when you want to
                    keep most of the existing field characters; for
                    example, when only the second character in a 20
                    character field needs to be changed.
  F4                Acts like `Enter' but causes some function to be
                    executed.  For instance, on the File form this
                    key indicates that all fields on the form are set up
                    and the specified algorithm is to be loaded.  In other
                    cases (e.g. Plot Controls form) the algorithm is
                    executed.  See the function key definitions at the
                    bottom of the form.
  Esc               Cancels modifications to the current field and
                    restores the previous, unmodified value.
+
EXIT THE FORM
-------------
  Esc               If the current field has not been modified then the
                    Escape key closes the form.

MISCELLANEOUS
-------------
  F1                Display help information for the highlighted field.
  Shift-F2          Allows direct access to another form without having
                    to exit the current form (this key also works in
                    the Editor).  Use `F10' to see your choices, or type
                    the first few letters of the form name.
