Sue Center does a lot, but not everything!
  1. The keystrokes you choose cannot be directed into another application (although you can export files to the My Documents folder).
  2. There is limited ability to edit what you have already produced.
  3. Each computer is devoted to one person. You can't have multiple email addresses and logins.
  4. The web browser is quite primitive showing only text and graphics with minimal formatting.
If these limitations are too constraining for you it may be time for you to graduate to using a re-directing on-screen keyboard (such as Click-N-Type among many) and a dwell clicker. These will give you full access to any program. See the Input Devices page for a discussion of dwell clickers.