[R] Question about Linear Regression

[Lorenzo Isella]

Dear All,
A semi-trivial question: suppose you want to carry out a linear regression  
of the kind

y~x1+x2+x3

where x3 is a dichotomous variable assuming only 0 and 1 values (x1 and x2  
are continuous variables).
Is there any particular caveat I should be aware of? Can I code this as a  
simple multiple linear regression into R or is there anything else I  
should bear in mind?
Many thanks

Lorenzo