It is possible to get help informations on various methods and classes by two different procedures:
Each method or class has a help file accessible through the R console:
# One way of doing it:
R>??methodName
# Another way:
R>help(methodName)
Each package has a more extensive documentation through the use of vignettes. If the package has more than one vignette, a text-based chooser is presented with number-based selections. You access the vignettes like this: