Please see the Poll.C file to see how to write Paragon doors and access
Paragon's DoorControl message port.  The following is a listing of all
the message port commands (some which are not shown in Poll.C).

Updated November 12, 1989 for Version 2.0.

doormsg->command == 1
Outputs the value of doormsg->string.  Sends out a terminating
cr/lf sequence if doormsg->data == 1.  Returns a value less than 0 in
doormsg->data if the user aborted the output with ^C.

doormsg->command == 2
Outputs doormsg->string to the screen only.

doormsg->command == 3
Outputs a single character (the value of doormsg->data) to the serial
port.

doormsg->command == 4
Outputs a single character (the value of doormsg->data) to the screen.

doormsg->command == 5
Outputs a single character (the value of doormsg->data) to the screen
and the serial port.

doormsg->command == 6
Outputs doormsg->string.  Will prompt input from user.  Will not allow
input to exceed doormsg->data characters in length.  Will return the
input string in doormsg->string.

doormsg->command == 7
Same as #6, but it automatically handles command stacking.

doormsg->command == 8
Outputs doormsg->string.  Will "hotkey" for a character, and return it
in the first array element of doormsg->string.

doormsg->command == 9
Commands Paragon that the user is to be hung up on.  The carrier flag
will be set to true;  the door program must still handle closing up
as normal!

doormsg->command == 10
Displays a text file with the name doormsg->string.

doormsg->command == 11
Finds out if the file doormsg->string is currently accessible by the
system.  Returns 1 in doormsg->data if it is available, -1 if it is
locked or not found.  This also handles wildcard ("*") and joker ("?")
search templates.  doormsg->string will return with the name of the
file if wildcard template search was used.

doormsg->command == 12
Edits the file called doormsg->string, and will not allow the file to
exceed doormsg->data lines in length.

doormsg->command == 13
Returns certain values in doormsg->data depending on the value passed
in doormsg->data.  1: User's access level, 2: Expert mode, 3: Net credits,
4: Number of calls, 5: Calls to system, 6: Graphics mode, 7: minutes
remaining, 8: screen columns, 9: screen rows.

doormsg->command == 14
Returns certain strings in doormsg->string depending on the value passed
in doormsg->data.  1: User's name, 2: User's password, 3: User's address,
4: User's city, 5: User's state, 6: User's postal/zip code, 7: path to
the doors, 8: main BBS path, 9: date, 10: time.

doormsg->command == 15
Changes the user's access level to doormsg->data.

doormsg->command == 16
Similar to #14, except it set's that string to the whatever doormsg->string
is.

doormsg->command == 17
Returns a random number from 0 to doormsg->data in doormsg->data.

doormsg->command == 18
Reset loss of carrier state;  makes Paragon think no carrier was lost.

doormsg->command == 19
Show graphic text file doormsg->string with correct extension based
on user's graphics mode.

doormsg->command == 20
Shut down DoorControl.  The door is now completed;  the door should now
end.  Paragon will continue as normal.

doormsg->command == 21
Add doormsg->data to the number of minutes user has remaining.  If this
value is negative, it will subtract minutes from the user's time.