Back in the day... well, back in .NET Framework 1.0, you could execute a web service from a browser using HTTP GET, for example:
http://webservername/vdir/webservicename.asmx/MethodName?parameter=value
But for security reasons, Microsoft disabled this by default in Framework version 1.1. This article explains the situation - http://support.microsoft.com/default.aspx?scid=kb;en-us;819267
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