Am I just asking too much to create website FORM for a membership sign-up in which each user input can be VALIDATED instantly? WordPress plug-ins Formidable Pro and Gravity Forms accept data with some degree of validation, but just don't appear to have the versatility and power to do all necessary to fully ensure that user input is both realistic and reasonable. Simple example, what if the zip code they provide is nonexistent? Can Formidable Pro or Gravity Forms check it against the list of known valid zip codes? If so, how? What if the user types both first and last names in the FirstName field and leaves the LastName blank? Can this be detected and request a correction from the user? Is it even possible to use an Accesss Form with embedded code on my Website?