- They are not visible in search results
http://drupal.org/project/search_config
- They are shown in a different container
Templating system, or blocks, or panels
- They are visible only to some users based on user-roles
EDIT
Those 2 steps are equal, but becose my understanding problem the last point can be different.
In /node/[your-webform-nid]admin/webformpeople/configurepermissions
In you should have the bottom you'll findoptions to allow only some roles to access the Submission access fieldset, that state:forms nodes.
These permissions affect which roles can submit this webform. It does not prevent access to the webform page. If needing to prevent access to the webform page entirely, use a content access module such as Taxonomy Access or Node Privacy by Role.