what is ".do"?

[ittgung]

I have to work with .do but i have no idea what it is.
So please let me know what is it? and how should i do to start it?

Thank you very much.

[chazzy]

.do is typically used as the default extension associated with struts java apps. are the source files .do? maybe you could post a small section of code and we can tell you what they are.