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\name{Plugins}
\alias{Plugins}
\title{R Commander Plug-in Packages}
\description{
Plug-ins are R packages that extend the R Command interface.
}
\details{
An R Commander plug-in is an ordinary R package that (1) provides extensions to
the R Commander menus is a file named \code{menus.txt} located in the package's
\code{etc} directory; (2) provides call-back functions required by these menus;
and (3) in an \code{RcmdrModels:} field in the
package's \code{DESCRIPTION} file, augments the list of model objects
recognized by the R Commander. The menus provided by a plug-in package are
merged with the standard Commander menus. It is also possible to remove menus
and menu items from the standard Commander menu file or from the files of
plug-ins installed before the current one.
Plug-in packages given in the R Commander \code{plugins} option
(see \code{\link{Commander}}) are automatically loaded when the Commander
starts up. Plug-in packages may also be loaded via the Commander
\emph{Tools -> Load Rcmdr plug-in(s)} menu; a restart of the Commander is
required to install the new menus. Finally, loading a plug-in package when
the \pkg{Rcmdr} is not loaded will load the \pkg{Rcmdr} and activate the
plug-in.
An illustrative R Commander plug-in package, \pkg{RcmdrPlugin.TeachingDemos}, is
available on CRAN.
A variety of utility functions is available to support R Commander plug-in packages;
see \code{\link{Rcmdr.Utilities}}.
For more details, see Fox, \emph{Writing R Commander Plug-in Packages} at \url{https://www.john-fox.ca/RCommander/plug-ins.html}.
}
\seealso{\code{\link{Commander}}, \code{\link{Rcmdr.Utilities}}}
\keyword{misc}
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