What do I need in order to use it?

A computer with an Internet connection, and the CACI Lotus Notes client software installed and configured on the computer. Be sure to configure your Lotus Notes Client for remote access by clicking on the "Lotus Notes Direct Over the Internet" button, which is located in your mail file in the CIS Instructions section. To use Lotus Notes after these requirements are fullfilled, simply open the Lotus Notes client software on the remote PC as you would at your CACI office and begin working.

From where can I access this? Any Internet connected computer.