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Check if user is logged in:

$sf_user->isAuthenticated()

Check if user belongs to a specific group:

$sf_user->hasCredential('admin')

The commonly used

$this->getRequestParameter('blah')

is a shortened version of

$this->getRequest()->getRequestParameter('blah')

All sorts of other goodies are available using $this->getRequest(), including for example:

$this->getRequest()->getPathInfo()