REBOL [
    Title: "Check for REBOL Pro Features"
    Date: 18-May-2001
    Version: 1.0.0
    File: %licensed.r
    Author: "Carl Sassenrath"
    Purpose: {An example of how to detect View/Pro and Command special features.}
    Email: carl@rebol.com
    Category: [util 1 script crypt lib db shell sound]
]

alert either system/user-license/id [
    "You have REBOL/View/Pro or REBOL/Command."
][
    "You do not have REBOL/View/Pro nor REBOL/Command."
]