'Initialize a session wrapper
@type portal: C{Portal}
@param portal: The portal that will authenticate the remote client
@type credentialFactories: C{Iterable}
@param credentialFactories: The portal that will authenticate the
remote client based on one submitted C{ICredentialFactory}'

def __init__(self, portal, credentialFactories):

    self._portal = portal
    self._credentialFactories = credentialFactories
