This page welcomes the user to OCA and states that this site can be used for the following tasks:
Approve certificate requests
Find a certificate or certificate request
Update certificate revocation lists
Search for and view log messages
There is also a box with tips explaining the tabs available on the screen, as follows:
The Certificate Management tab lets you search for certificates and certificate requests by ID, serial number, or Common Name.
The Configuration management tab lets you set up notifications and alerts, generate certificate revocation lists, and manage certificate policies.
The View Logs tab lets you search logs for a particular string, or to select one of the available logs for viewing.