Mobile code technologies include, for example, Java, JavaScript, ActiveX, PDF, Postscript, Shockwave movies, Flash animations, and VBScript. Usage restrictions and implementation guidance apply to both the selection and use of mobile code installed on organizational servers and mobile code downloaded and executed on individual workstations. Control procedures prevent the development, acquisition, or introduction of unacceptable mobile code within the information system. NIST Special Publication 800-28 provides guidance on active content and mobile code.