output
numeric value: 1 = function names only, 2 = function names with brief description,
3 = functions and their arguments, and 4 = function R-code (default).
...
allows user to specify two additional arguments for output=2:
remote - character string giving a valid URL for the R_HOME
directory on a remote location;
update - logical: if TRUE, attempt to update the package
index to reflect the currently available packages.
(Not attempted if remote is non-NULL.)
Also, if user specifies pat=TRUE, then funs, if specified,
are treated like patterns.