What Is the 400 School?

Who Are Our Customers?

At The 400 School, we specialize in on-site instructor-led lab-style classes. Customization to meet your individual requirements is always a top priority for The 400 School. The 400 School provides training to many of the largest corporations and organizations in the world, as well as Federal, State and Local Government bodies. Click here for a partial list of recent customers.

Now Accepting Credit Cards

The 400 School can now accept your corporate or personal credit card in payment for any class fees. 

Contact your 400 School Training advisor for details on enrolling and paying by Visa, Mastercard, American Express or Discover Card.

I encourage you to check out the upcoming schedule, and register for the training you need. The class sizes are strictly limited, please register early. 

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Your Instructor - Dan Riehl

Dan RiehlDan Riehl is the President and Instructor of The 400 School. Dan is also a Senior Technical Editor and author for System iNEWS Magazine, where, for over 20 years,  he has written numerous articles related to Security, Programming and Systems Management. Dan is the author and editor of the System iNetwork's Systems Management Newsletter provided through the System iNetwork.

Included among the award winning books that Dan has written are:

  • AS/400 PowerTools (Volume I & II)
  • Control Language Programming for the IBM i
  • Control Language Programming for the AS/400
  • Desktop Guide to AS/400 Programmer Tools
  • Power Tips for OS/400 Security