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From Odwiki

Houdini traverses the HOUDINI_PATH for certain startup scripts.

Houdini has 2 types of startup scripts written in Houdini's scripting languages, HScript or HOM. If a HOM script of the same type is detected before the HScript equivalent, the HOM one will take precedence.

• 123.cmd or 123.py: This is run on Houdini startup if Houdini is invoked with no arguments. This defined the default scene in Houdini. This is a convenient place to place custom variables or custom nodes for default scenes.
• 456.cmd or 456.py: This script is run after any hipfile is loaded. This is extremely useful for ensuring that any set variables inside your scene files are up to date, especially in larger work environments where updates are being done to the setup constantly. Variables inside of Houdini can kept current and operators that are not part of the OTL automatic update process can be updated.