Elwin,

You can make each module visible or invisible on a page.  Just go to the Module-->Settings.  Then uncheck the "Inherit view settings from page" check box.  You can then make the module viewable or not for any group.  For example, I show a log-in module on the home page for unauthenticated users but once they log-in, it disappears.   It works like a charm.

Bill

Thanks for your answers.

It is not what I am searching for. Assigning security roles to pages and modules are clear to me.
I will try to explain my needs.

I have a homepage with general information about the company. Registering is disabled.
All persons have a loginname and a password to login. In a relation table a field is used to mark the person as employee or manager. Managers and employees are registered users when they log in.

When a manager logs in, a link-module must appear with extended possibilities for manager.
When an employee logs in, an other link-module must appear with the extended possibilities for employees.
The link-module for managers is invisible now.

I hope the above makes everything clear.