CSR: where's the documentation on and _# #_ ?

I found some examples of Client Side Rendering on the Internet, where the notations <# #> and _# #_ are used to insert JavaScript in the templates.

Where could I find more detailed information on how to use <# #> and _# #_ ?

Some examples I came across:

http://social.msdn.microsoft.com/Forums/en-US/sharepointdevelopment/thread/038c22e9-353f-4623-9e9f-ef2f82db3708

http://blog.jussipalo.com/2013/05/sharepoint-2013-linking-item-titles-to.html

http://blogs.technet.com/b/speschka/archive/2012/07/23/using-query-rules-result-types-and-display-templates-for-a-custom-search-sales-report-in-sharepoint-2013.aspx

Christophe Humbert Path to SharePoint http://blog.PathToSharePoint.com User Managed Solutions http://UserManagedSolutions.com