how do the squirrelmail/roundcube read from ispconfig users?

[fishown]

hi ther, im haveing problem to install roundcube/squirrelmail,
As i saw, the roundcube have his own user table in the mysql
and in any tutorial i couldent find the liked part betwen the ispconfig to roundcube table...

if some one can explain to me how the roundcoube sould read from ispconfig
i will be greatful.

thank you =].