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3.5.5. Creating PAM Modules

You can create or add new PAM modules at any time for use by PAM-aware applications.
For example, a developer might create a one-time-password creation method and write a PAM module to support it. PAM-aware programs can immediately use the new module and password method without being recompiled or otherwise modified.
This allows developers and system administrators to mix-and-match, as well as test, authentication methods for different programs without recompiling them.
Documentation on writing modules is included in the /usr/share/doc/pam-<version-number>/ directory, where <version-number> is the version number for PAM on your system.