[Gvsig_english] Creating new layer--specific lines

[triestem]

Hello!  I'm sorry if this question is hopelessly unchallenging.  

I'm trying to create a new layer--I have two point locations, and I need
them to be connected by a line that is exactly 180 degrees--but only so that
I can then create lines going through those points at exactly 90 degrees
from the first line.  Does that make sense?  I need one line through each
point, each line perfectly perpendicular to the axis that's created by
connecting the two points.  I've been eyeballing this with the draw tools,
but haven't been able to figure out how to make it more accurate, but I
figure there must be a way.  

I have looked through the manual, and attempted to follow the instructions
for entering commands, but nothing good came out of it.  If anyone could
offer any tips or tricks, I'd really appreciate it.

Thanks!

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