st: vce(boot) - clustering?

[Scott Cunningham <scunning@gmail.com>]

I'm estimating a Poisson with fixed effects model using -xtpoisson-.   
To correct for overdispersion, I am using -vce(boot)- to bootstrap  
the standard errors.  Where can I find a description of the algebra  
used for -vce(boot)- when attached to the -xtpoisson- command?  I  
tried -help vce(boot)- and -help xtpoisson- but didn't see anything.   
Also, am I correct that -xi: xtpoisson depvar indepvar, fe i(id) vce 
(boot)- will create robust and clustered standard errors?

scott
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