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Once the script is run it will save the resulting HDA files in the default user directory unless otherwise specified. You can change this location by setting the following environment variable, RFH_USER_PREF_DIR. If this isn’t set, the HDAs will be saved in HOUDINI_USER_PREF_DIR

Once these have been created, you can reuse them by resetting the RFH_ARG2HDA environment variable to 0