[R] key in margin area

[Jeremy Z Butler]

Hi
Is there any way to position a key (legend) outside the plot area? i.e. in 
the margin between plot area and page margin. I realise I could achieve the 
same effect by creating a larger plot but not printing the axes and then 
draw the smaller axes independantly leaving room for the key. However, that 
wont work very well in my particular case.
Thanks in advance
Jeremy