Functionality of Sniff and wrappers in dogtail

[Raghu Sarangapani <raghu sarangapani wipro com>]

hi there,

Need some clarifications on sniff and wrappers.

Dogtail includes sniff which is known as at-spi browser. Is this something similar to at-poke?
What is the functionality of sniff in dogtail, how is this used in writing test scripts?

What are wrappers? and is it necessary to write wrappers for every application before writing test scripts?

awaiting your response.

Regards,
Raghu