I already have a form that has an Employee List.  There needs to be a confidential PIN number for each employee.  The employee would enter this in during the creation or revision of his/her record in the Employee List.   Is there a way to hide the characters the employee enters during the record creation or revision?

Is there also a way to validate that the employee has 4 numbers in his/her pin?

The pin will be compared against when entering training records for the employee.