[R] Does R always insist on sending plot output to a file?

[Donald Paul Winston]

I need to write the output of a R plot to a Java OutputStream. It looks like
R insists on sending it's output to a file. Is there anyway to get bytes
directly from the output of a plot so I can write it with Java? Writing it
to a file is too slow.

Is there a parameter in the graphics device function png(..) that directs
output to a variable in memory? 

x <- plot(.)  would make sense.
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