Hub Communications Module



     In a typical listing exchange service using Realty Vision,
     all new listings and changes are entered into the system
     by the listing agents. The hub computer merely collects
     and redistributes data, operating unattended, eliminating
     all paperwork, human labor, data entry errors, etc. which
     characterize the conventional multiple listing operations.

- Minimum hub hardware needed is a 386 class personal computer with 4mb of memory, which
   may be bought for literally a few hundred dollars nowadays. Its modem usage is so efficient
   that, a single modem/phone line can easily serve dozens of offices/agents around the clock.
- Future revisions of Realty Vision may add support for up to 4 modem lines, without requiring
   any special hardware beyond installing 1 to 3 more modems inside the hub computer. In case
   more modems are needed, additional inexpensive PC's can be set-up as servers, for still less
   than what it would cost to expand traditional multi-user computer hardware.

  Realty Vision hub requires very little human attention per day,
  a few minutes to do the daily process plus the time it takes to
  do the daily data backups.

  The hub operator never interferes with property data. The daily
  process, which creates the hotsheets, etc. is fully automated,
  requiring just a few mouse clicks. Operator interaction is only
  needed occasionally, to maintain user access passwords, etc.

- In addition to or instead of the Realty Vision's built in backup functions, system backups can be
   made more efficiently by using tape drives or other high capacity media instead of floppy disks.
- The daily process also allows the hub operator to include a non-private message of any length, to
   be broadcast to all node users, as part of the following day's download files.

     Hub software keeps track of all steps of the daily process, as
     well as all the steps of communication sessions between the
     hub and the user nodes, into two separate log files which can
     be viewed and printed as needed.

     In time, as the log files grow past a certain size, the operator
     is reminded to edit these files to delete the older parts, which
     may be done using functions available in the viewing screens.

- Access to Realty Vision hub is much more secure than with conventional on-line systems, simply
   because the hub does not carry any conversations intelligible to humans, like asking user names,
   ID's, passwords, etc. The hub answers calls and waits for calling nodes to initiate a proprietary
   "hand-shake", not giving the would-be intruders any clues to even know where to start guessing.

  Uploading and downloading to and from a Realty Vision hub
  can also be done using floppy diskettes. This feature would
  probably never be used on a regular basis but may save the
  day in some cases, such as a user's modem breaking down
  and taking several days to repair or replace. This is just an
  example of the measures taken by Realty Vision in order to
  protect its users from being stranded, even in the most rare
  or unlikely situations.


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