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hsc is able to check existence of local URIs in you HTML-project. When you refer to a non-existing local link within your source, hsc will display a warning message.
The URI-checking can be enabled using the ChkUri switch. As far as I know, there is know way to find out if a URI on some far away host exists within ANSI-C. So hsc never will support URI-checking on non-local URIs.