secure a web service

what's the best way to secure a 1.1 web service that should only be consumed
by a 1.1 desktop application?  I can't lock it down to an ip address because
it will be used by many people at different locations, but I just want to
make sure that only this app is using the web service.  I thought I heard
wse only works for 2.0.

thanks.






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