Controlling memory of session

Hi,

I'm using Postgresql 8.1 on windows2000 and I have a hard time
understanding how to limit the memory of the sessions to 1 MB.

What I have right now is that each connection (opened with jdbc) takes
about 3MB (some take a little more, some a little less). I think that
this is a waste of memory (am-I wrong?).

I've read the doc
(http://www.postgresql.org/docs/8.1/static/runtime-config-resource.html)
for work_mem and temp_buffers and they have this value:

work_mem = 1024
temp_buffers = 100

What am I missing to limit the memory taken by session to 1MB?

In addition I'd like to understand better temp_buffers. I never create
temporary tables but I wonder if postgresql does it behind the scene
when I do some big selects.

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