st:multivariate linear reg

["stata_user stata_user" <stata_dofile@hotmail.co.uk>]

I would like to ask about the difference between a simple linear regression 
of 3 depdent variables Y1 and Y2 and Y3 with a independent variable X

and the the multivariate version which regress (Y1,Y2,Y3) with X  (test 
statistics used in each case, interpretation of the output , if possible), 
and how to do it in stata?

many thanks in advance?

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