[dev] Login to Horde with PHPBB info??

[JLA ENTERPRISES DIRECT]

Does anyone know how the following can be made to happen
 
A logged in PHPBB user would open a PHPBB page that contained horde in a
frame within that phpbb page.  Horde in this case is already setup to
authenticate using the phpbb user tables as configured in the horde settings
(this works with no problems)  Trying to have the user automatically logged
into horde without the need for them to type in their username/password once
again.
 
Thank You