BBS software question (GBBS or the Underground?)

["Ernest" <ernestls@home.com>]

I have several disks that are supposed to be the backup disks for an Apple
II BBS . The disks are labeled "The Underground." There is a system startup
disk, and a Bulletin Boards 1,2, & 4 disk. I'm not sure if these disks are
for a BBS called The Underground, or if it's a BBS program called The
Underground (like Proline?)

When the system disk boots, the display reads, "The Underground now
loading..." and a ] prompt appears.

Does anyone know what commands I would type to use this BBS software?
Here is a catalog list of the 5.25 size "system" disk.

]CATALOG

PRONTO-DOS V254    FS=126

  A 002 HELLO
  B 003 BIOS.CAT 212
*B 006 GBBS DRIVER
*B 006 GBBS DRIVER
  B 008 GBBS II DRIVER
  B 002 DRIVER DATA
  A 113 GBBS 5.2 - 05/07/85
  T 002 DATA
  A 012 GBBS II USERLIST
  A 013 BAD SECTORS STUPID
  A 046 AND THIS ONES GONE ALSO
*B 002 BIOS.CAT 103
*B 002 BIOS.MMS
*T 004 BIOS.CLOCKS
  A 003 ROOM LIST GEN
  B 019 BAD FILE HERE TOO
*B 006 ESCAPE SAVE
  A 114 GBBS 5.3 - 05/12/85
  B 007 DOS-UP

There are several 5.25 size "underground" related disks, including:

Bulletin Boards Disks 1-4
Data Disk "17 sector Catalog (E-Mail Disk)
Data Disk "27 sector Catalog (Bulletin Disk)

Can anyone offer me any clues about these BBS disks? Working commands would
be great, or if GBBS or the underground means anything to anyone, let me
know so I can research it on the net. I would like to get this BBS back up
for fun if it's possible.

Ernest