This question is not about PDN articles. It has been asked on behalf of a customer implementing Pega Knowledge. They are looking for a way for a Pega Knowledge user to send a URL to a read only view of a Pega Knowledge case to a non-Pega user.
Pega Knowledge 7.31 (coming this Fall!) will provide an OOTB feature that allows referencing other articles "within" an article. The end user, such as a Pega Customer Service CSR, would simply click on the referenced article link (title), and the referenced article will be displayed in a separate browser window.
The authoring portal will provide an easy way to search and identify the articles they want to reference.