If I am logged into an S-Net Business entity, can I easily navigate to another S-Net Business entity or to S-Net?

Yes, this is possible without needing to reauthenticate.

To switch between S-Net Business entities, you can:

Select the entity by clicking on the dropdown menu in the navigation sidebar at the top left of the screen.

Alternatively, you can click on the user profile and select "Return to portal”.

The "Return to portal" feature not only allows you to navigate to another entity within S-Net Business but also to S-Net and vice versa.