Why do you have several almost identical websites?

To provide the highest quality service with the least interruption, we operate several mirror sites for the convenience of our valued customers. PDHcenter.com, PDHcenter.org and PDHonline.org are just some of the websites owned and maintained by our organization. If you have difficulty in accessing one of our websites, please try to access another one. All of our online courses are available through any of the above websites. You may even use the same user ID and password to access any of our websites. ... more