Internet Explorer extension and trusted certificate

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When writing a IE browser extension and/or plug-in,
I encountered this problem: the user visits
an https site whose certificate is not trusted
by the local computer, but the user "tursts" it for
this session anyway (by clicking the button on the
warning dialog)... at a later time, my plug-in encounters
a certificate that is not trusted,
but I want to compare this certificate against the
certs that are "trusted" by the user
earlier during this session (so that it wont
be prompting the user twice for the same ceritificate)

So, is there a way for me to grab those certs so
that I can compare the one I got with those (I am
talking about APIs, wininet calls etc) ?

Thanks alot for your help.

.

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