[R] Using interactive plots to get information about data points

[jcarmichael]

I have been experimenting with interactive packages such iplots and playwith. 
Consider the following sample dataset:

A  B  C  D
1  5  5  9
3  2  8  4
1  7  3  0
7  2  2  6

Let's say I make a plot of variable A.  I would like to be able to click on
a data point (e.g. 3) and have a pop-up window tell me the corresponding
value for variable D (e.g. 4).  I am also trying to produce multiple small
plots.  For example, four side-by-side boxplots for each of the four
variables A, B, C, D.

Any help would be greatly appreciated!  Thanks!
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