You can't unless you use a frameset.
SSI will only work for pages within the same domain.
FP Includes will only work for pages within the current web (root web or subweb)
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Thomas A. Rowe (Microsoft MVP - FrontPage)
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If you feel your current issue is a results of installing
a Service Pack or security update, please contact
Microsoft Product Support Services:
http://support.microsoft.com
If the problem can be shown to have been caused by a
security update, then there is usually no charge for the call.
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