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\name{tk2dde}
\alias{tk2dde}
\alias{tk2dde.exec}
\alias{tk2dde.poke}
\alias{tk2dde.request}
\alias{tk2dde.services}
\alias{.tk2dde.require}
\title{ Use DDE (Dynamic Data Exchange) under Windows }
\description{
These functions are Windows-specific. They issue an error under a different
platform.
}
\usage{
tk2dde(topic = NULL)
tk2dde.services(service = "", topic = "")
tk2dde.exec(service, topic, command, async = FALSE)
tk2dde.poke(service, topic, item, data)
tk2dde.request(service, topic, item, binary = FALSE)
}
\arguments{
\item{topic}{ the 'topic' to reach or expose. A DDE server is accessed as
'service'|'topic'. In the case of \code{tk2DDE()}, a non null topic activates
the DDE server, and a null topic deactivate it. }
\item{service}{ the name of the service to reach. In \code{tk2DDEservices}, if
both service and topic are empty, the list of all available DDE service is
returned, otherwise, only available topics for a given service are listed. }
\item{command}{ a string with the command to run in the external application
(syntax depends on the server). }
\item{async}{ is a command run asynchroneously (returns immediately, before
the command is processed), or not? }
\item{item}{ the concerned item (usually a variable name, a range in a
worksheet, etc...). }
\item{data}{ the new value for the item. }
\item{binary}{ should the return bez treated as binary data or not? }
}
\keyword{ utilities }
\keyword{ IO }
\concept{ Interprocess communication, DDE }
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