(This article was first published on R Tips's blog, and kindly contributed to R-bloggers)
R will can save the users workspace at the end of a session so that he can take it up again where he left off. I personally don't like doing this but there are times when one would want to save their work, especially after complex and time consuming computations.
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Zero Inflated Models and Generalized Linear Mixed Models with R.
Zuur, Saveliev, Ieno (2012).