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15357 jmc 1 
\name{Session}
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\alias{sessionData}
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\alias{traceOn}
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\alias{traceOff}
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\alias{browseAll}
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\title{Deprecated:  Session Data and Debugging Tools}
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\description{
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  The functions \code{traceOn} and \code{traceOff} have been replaced by
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  extended versions of the functions \code{\link{trace}} and
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  \code{\link{untrace}}, and should not be used.
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}
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\usage{
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sessionData()
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traceOn(what, tracer=browseAll, exit=NULL)
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traceOff(what)
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browseAll()
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}
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\details{
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  \describe{
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    \item{\code{sessionData}:}{
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      return the index of the session data in the search list,
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      attaching it if it is not attached.
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    }
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    \item{\code{traceOn}:}{
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      initialize tracing on calls to function \code{what}.  The function
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      or expression \code{tracer} is called on entry, and the function
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      or expression \code{exit} on exit.
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    }
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    \item{\code{traceOff}:}{
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      turn off tracing of this function.
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    }
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    \item{\code{browseAll}:}{
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      browse the current stack of function calls.
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      Uses the function \code{debugger} to set up browser calls on the
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      frames.  On exit from that function, computation continues after
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      the call to \code{browseAll}.  Computations done in the frames
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      will have no effect.
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    }
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  }
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}
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\references{
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  See \emph{Programming with Data} (John M. Chambers, Springer, 1998)
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  for the equivalent functions.
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}
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\keyword{internal}