intro —
introduction to the Lua modules
This section provides an overview of the Lua modules, their functions, error
  returns and other common definitions and concepts.
The Lua modules provided by NetBSD
  are:
  - bozohttpd
- Access libbozohttpd(3)
      functionality.
- gpio
- Access gpio(4) pins.
- netpgp
- Access libnetpgp(3)
      functionality.
- sqlite
- Access sqlite3(1)
    files.
- syslog
- Access syslog(3)
      functionality.
Anintro manual for Lua modules appeared in
  NetBSD 7.0.