This login procedure works with Macs and Windows
Make sure you have an install of Citrix on your computer.
Using your browser go to https://access.centegra.com
You should see a login screen similar to this
Enter your username and password.
The following screen should be seen. Click in Citrix Web XenApp.
You will see the following screen. Click on Webstation for Physicians.
You should be taken to the following familiar login screen.