Ajax in Web dynpro java

Hi experts,

Please clarify about the usage of AJAX in webdynpro java ce7.2.

The doubt is how to use ajax in ce 7.2 certain document says that ajax is embeded in 7.2 .

All what I found is navigation API's and implementation of TLN, DLN etc using AJAX and AFP as the default framework page.

Is it possible to use Ajax in webdynpro java?

Is there are jar files for using navigation API?

Please

Thanks and Regards,

Vibha