The classes, which are $425, will be given on the 43d floor of 1 World Trade Center.

Eventually they tracked down everybody except 11 employees who had been working in a client's offices on the 94th floor of 1 World Trade Center.

He got a call that people were trapped in a secret security command post on the 22nd floor of 1 World Trade Center.

He reported to the 97th floor of 1 World Trade Center.

He worked on the 106th floor of 1 World Trade Center from 7 a.m. to 3 p.m. each day, but that was not his only job.

These days, it has more distinctive quarters: a small office on the 63d floor of 1 World Trade Center.

He worked on the 88th floor of 1 World Trade Center as construction manager for the Port Authority.

He and a group were fleeing the 99th floor of 1 World Trade Center.

It had 57 employees on the 50th floor of 1 World Trade Center when the noontime explosion rocked the building.

It is available at the public-services division on the 62d floor of 1 World Trade Center or by calling 466-4170.