FIELD FORMATS

     All the field assignment procedures (e.g. String_Field, Real_Field)
     include a parameter of type string that defines the precise format of
     the input field.

     There are 4 pre-defined format characters in the Toolkit:

          #         allow 0..9, '.','-', and 'e' for scientific

          @         only letters of the alphabet and punctuation

          *         any character the user can find!

          !         all letters are converted to upper case

     Any other characters in the format string are treated as fixed and for
     display only. For example, if the input field is a telephone number,
     then the format might be defined as '(###) ###-####'. The user will
     only be allowed to input numbers and, after typing three numbers, the
     cursor will jump three positions to the right, to the next #
     character.