If you're trying to locate missing friends or relatives, here are the best places to start your search:

• Hospital Patient Locator System
• Additional Missing Persons Information

Many other sites list telephone hotlines for locating missing people. Some of the best information is here:

• Official New York City Web Site
• White House Resource List
• Senator Hillary Rodham Clinton Resource List

I would also urge you to contact the Red Cross or your local hospital to find out where to donate blood, and to locate what relief services you can in your own area and ask them what you can do to help in this time of tragedy. Here are a few more places to start looking, in addition to the sites above:

• American Red Cross
• The White House

Official word from some prominent affected companies can be found here:

• Cantor Fitzgerald and eSpeed
• Morgan Stanley

This site maintains an excellent list of informational contacts at companies housed in the World Trade Center:

• Company Contacts

Tributes to victims can be posted here:

• America Survives

The following sites continue to provide possibly helpful message boards for those searching for survivors, though I must emphasize that these are not official sources and may contain significant misinformation:

• Millennium Cluster at Berkeley
• "I'm Okay" Message Board
• World Trade Center Survivor Database
• Disaster Message Service
• New York/DC Survivor Resources
• World Trade Center People Locator
• Survivor List
• Missing Persons Message Board
• Terrorist Strike Check-In Registry
• US Irish and UK Survivor Register
• Council of Hellenes Abroad

Please note that I have nothing to do with the sites listed above. I'm sorry, but I cannot answer questions about individual names on those lists or about the methods used to compile those lists.