This question comes up periodically: Is it possible to bookmark a specific EBS OA Framework page and then successfully open that page even if the user is not logged in?
The answer is a qualified yes. This is technically possible, but the page must be built to support that by an OA Framework developer. It is not possible for EBS end-users to change an OAF page's definition.
Developers can make pages bookmarkable by following the instructions described in the OA Framework Developer's Guide, Chapter 6: Advanced OA Framework Development Topics > Security > Accelerated Validation > Bookmarkable Pages. Here's a link to the latest version:
The main requirement is that the page be self-secured with some associated supporting code. The same requirement applies to EBS links included in Workflow email notifications, too.