[R] Timer in R?

[Jonathan Williams]

Would anyone be so kind as to write a routine to time 
mouse button presses in R to the nearest millisecond?

If R had a timer of this kind and a few basic screen
handling routines (to write characters or graphics of
different sizes and colours at precise times) then it
would make it easy to use it for on-line data analysis
of data to control EEG experiments.

Thanks,
Jonathan Williams

Jonathan Williams
OPTIMA
Radcliffe Infirmary
Woodstock Road
OXFORD OX2 6HE
Tel +1865 (2)24356