Passing arguments from IE to Outlook?

I've been using the article 'Developing .NET Smart Clients for Microsoft
Office XP'
(http://msdn.microsoft.com/library/de...-us/dnoxpta/ht
ml/odc_dnscof.asp) to get familiar with building an add-in for Outlook 2002
with C#. We have a home grown web based CRM that and I would like to use a
link to open a new Outlook message (the way that private.php?do=newpm&u=
does), but based on whether or not a variable was there call the add-in to
perform a database function.
Such as:
if (addHistory == true)
// add note for contact to sql server for contactRecordId (also passed
in...)

How would one do this? It would be nice to be able to use something as
simple as a mailto: link that allows for you to pass subject, etc... but be
more like:
private.php?do=newpm&u=?subject=whatever&addHistory=true&contactId=012z43

etc...

I need to know if this is possible, or a direction to go before spending too
much time going down a dead end road...

thanks for your help...
mo