Netscape MANAGEMENT SYSTEM 4.5 Installation And Setup Manual page 171

Certificate Manager, Registration Manager, and Data Recovery Manager in
Figure 4-4
separate instances
NOTE The current design of Certificate Management System assumes that
most deployments will rely on a single Data Recovery Manager
(associated with either a Registration Manager or a Certificate
Manager). However, it is also possible to write custom policies that
support multiple Data Recovery Managers. This might be useful,
for example, for subordinate CAs that issue certificates for
completely independent organizations.
Topology Decisions
Chapter 4 Planning Your Deployment 171