Automatic EXTRUDE and Boolean operations

Hi,
I'm trying to set up some scripts to automate EXTRUDE and Boolean
operations like SUBTRACT.
EXTRUDE seems to be OK, as I can create a shape, then select it using
'Last'.
E.g. to extrude a circle by 20 units:
_CIRCLE
0,0
10
_EXTRUDE
Last
20
0
However, if I create two objects (A and B) and I want to subtract B
from A, I can still specify B as Last, but how do I identify A (the
'2nd Last')?
E.g.
_SUBTRACT
'2nd Last'
Last
I can use 'Crossing' and specify a window to select A, but this is a
bit crude. Is there a better way?
Thanks for any info.
Reply to
sploo
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