Chapter 1, How PNS works provides an overview of the internal working of ALG, for example, how a connection is received.

Chapter 2, Configuring PNS proxies describes the general concepts of configuring ALG proxies.

Chapter 3, The PNS SSL framework explains how to handle SSL-encrypted connections with ALG.

Chapter 4, Proxies is a complete reference of the ALG proxies, including their special features and options.

Chapter 5, Core is the reference of ALG core modules which are directly used by gateway administrators, forming the access control and authentication framework.

Appendix C, PNS manual pages is a collection of the command-line PNS utilities.

Appendix B, Global options of PNS is a reference the global options of PNS.