[Catalyst] catalyst and dojo, ajax come from?

[疾驰者]

Hi:
  I may be a newbie to catalyst or dojo. 
  My app is a data heavy app, the major function is to import data, manipulate data and display data.
  I want to use Catalyst, TT, dojo develop this app. My question is about ajax, catalyst include ajax and dojo include ajax. In such app using catalyst and dojo, what's the true function about ajax from catalyst or dojo?

  Thanks any response.
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