The login page that employees or client employees go to login can be customized. For example, the client will go to to log into their sponsored portal that "vendor" provides or an internal employee goes to their portal. To customize the login page, go to Administration > Configuration > Content Management.

Click on each anonymous or home page view to set the template. There are language options as well.

Here is an example login page with all Home Page options set:

The anonymous order view template is for users who receive an order notification that has the anonymous order view url link it it. The user can then view the order only without needing to log in. The url link is a variable in the Client Communication email notification templates under Administration > Notification Settings > Direct Communications.