what's the meaning of the DIR setting in gen_be cv6 script?

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the script for cv6 is WRFDA/var/scripts/gen_be/wrapper_run_gen_mbe.ksh

there is four DIR setting in this ksh script :
DAT_DIR(Top-level data directory)、REG_DIR(Region-specific data dir)、FC_DIR(Forecast directory)、EXP_DIR(Experiment-specific data dir.)

Does anybody know the detail meaning for DAT_DIR and DAT_DIR ? What does it use for?

How to generate the data for DAT_DIR and DAT_DIR ?

Thanks a lot .