SCREEN DOOR
                        By Garry W. Elmer
                       K-9 BBS, Mystic, CT

This program allows the BBS to call you back and establish a 
connection verifying that the number you say you are calling from, is 
really where you are calling from, and prevents duplicate accounts 
from being opened. 

The program will present you with a 4 character "password" in the 
opening screen.  When the program calls you back it will ask for 
these 4 characters and upon entry, your access will be upgraded and 
you will have full use of the board.

LD (Long Distance) Callers -

Though I do not have the door configured to allow toll call LD 
callback, if you are in a PC Pursuitable area, it will call you back 
(between the hours of 1815 and 0645 weekdays, and 24 hrs/day on 
Saturday and Sunday.  If you are not sure if you are in a PC 
Pursuitable area, try the door and it will tell you.

PC PURSUIT VALIDATION - Since the PC Pursuit phone service has a 90 
second "grace" connection period, the door is set to terminate the 
call just prior to the end of this period.  (Thank you SPRINT!) 
After all the PC Pursuit "overhead", you should have about 30 
seconds to answer and enter the password.  You must have your modem 
answer quickly and you must enter the password quickly.  After 
validation, the door will terminate the call.  

START -

To start the callback sequence, select the number that your modem is 
connected to and the program will start the callback.  Approximately 
30-45 seconds later, the BBS will call the number you selected.

YOU MUST BE READY!

   Depending what modem, software and computer you have will dictate 
what you do next.  The BBS will call your computer.  You will either 
get RING on your screen, hear the ring from your modem, or the modem 
will answer automatically depending on how your system is set up. Once 
you know the BBS is calling, whatever your system requires you do to 
answer incoming calls must be done.  "ATA" is usually the modem 
command entered from the terminal mode to tell the modem to answer the 
phone, or "ATS0=1" typed immediately after the computer hangs up or 
"S0=1" added to the modem initialization string will cause the modem 
to answer automatically.  This could vary depending on your system.  
DO NOT use your COM program's "mini BBS" type mode if it has one. 

Once your modem has established a connection, you'll get a prompt

PASSWORD?

You'll get 3 tries at giving back the 4 character password. 

   If you are unsure as to how to make your computer answer, log off 
and study your documentation.  You can use this door to validate 
yourself whenever you choose to log on again.