[R] selecting a coordinate from a graph

[Richard Bonneau]

hello everyone,

What is the method for selecting a coordinate from a graph
with the mouse, if any such function exists? For example, we
would like to select outliers in a scatter-plot  with the mouse, or
add figure legends with the mouse.
There was a way to add figure legends with the mouse in Splus
but I haven't  found such functions in R.

Thanks,
Rich