You can use third party software programs, such as Linkbot, which will verify internal and external links. It costs $49.00 for personal use. You can find out more information at
http://www.linkbot.com/
Some of the advantages of this program are:
1) Comprehensive Reports
2) Verification of Internal and External Links.
3) Fast processing for medium size web sites.
4) Creation of current site maps.
Some of the disadvantages of this program are:
1) Extreme amount of overhead in terms of disk space. Typically reports for web sites with over 6,000 links (external and internal) takes up about 5 MGS of disk space per report.
2) Not conducive for on-line viewing of reports. Since the files are quite large, it takes a long time to download.
There are also other comprehensive programs that verify links, including WebTrends Log Analyzer Pro....
http://www.webtrends.com/
More programs are located at cgi-resources.com.
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Eliot Lee
Founder and Editor
Anthro TECH, L.L.C
http://www.anthrotech.com/
info@anthrotech.com
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Coconino Community College
http://www.coco.cc.az.us/
Web Technology
Coordinator
elee@coco.cc.az.us