Difference between "read" "restricted read" and "view only" permissions in SharePoint 2007

What is the difference between read, restricted read and view only permissions in SharePoint 2007?

Read - Read-only access to the Web site.

Restricted Read - Can view pages and documents, but cannot view historical versions or review user rights information.

View Only - Members of this group can view pages, list items, and documents. If the document has a server-side file handler available, they can only view the document using the server-side file handler.

I can view the above help message beside each and every permission. I can't really understand the view only permission.

These links may also be of some use.

When should I use 'view' instead of 'read only' in SharePoint permissions?

Link

The View Only gives you a few extra abilities like:

• View items in lists, documents in document libraries, and view Web discussion comments.
• View past versions of a list item or document.
• View forms, views, and application pages. Enumerate lists.