[vtkusers] Common.state.idle() and Common.state.busy() doccumentation?

[jeremiah newbie]

Hi all,

I was wondering if anyone could point me towards some 
doccumentation regarding the Common.state.idle() and 
Common.state.busy() methods.  I've seen them called in the MayaVi 
source code and I'd like to learn a bit about them if possible. 
(i.e.: is it possible to interrupt a busy() call and what exactly 
is going on during those calls)

Thanks in advance,

Jeremy 

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