AHT CORP

Q: Jun 30 2000

FY: Dec 31 1999

Q: Mar 31 2000

FY: Dec 31 1999

FY: Dec 31 1999

Q: Sep 30 1999

Q: Jun 30 1999

Q: Mar 31 1999

FY: Dec 31 1998

FY: Dec 31 1998

Q: Sep 30 1998

Q: Jun 30 1998

Q: Mar 31 1998

FY: Dec 31 1997

FY: Dec 31 1997

Q: Sep 30 1997

Q: Jun 30 1997

Q: Mar 31 1997

FY: Dec 31 1996

Q: Sep 30 1996

2,7

FILED AS OF DATE: 19990216

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Prospectus Supplement with Pricing Information

Amended Initial Registration Statement

Amended Initial Registration Statement

Amended Initial Registration Statement

Registration (IPO) statement under Securities Act of 1933

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Prospectus Supplement with Pricing Information

No description available

Amended Initial Registration Statement

Amended Initial Registration Statement

Amended Initial Registration Statement

Amended Initial Registration Statement

Registration (IPO) statement under Securities Act of 1933

Definitive Proxy Statement

Preliminary Proxy Statement

Definitive Proxy Statement

Definitive Proxy Statement

DIMENSIONAL FUND ADVISORS INC

DIMENSIONAL FUND ADVISORS INC

DIMENSIONAL FUND ADVISORS INC

DIMENSIONAL FUND ADVISORS INC

TUDOR INVESTMENT CORP ET AL

CYBEAR INC

CYBEAR INC

KNOTT DAVID M

TUDOR INVESTMENT CORP ET AL

DIMENSIONAL FUND ADVISORS INC

DIMENSIONAL FUND ADVISORS INC

RS INVESTMENT MANAGEMENT CO LLC

TUDOR INVESTMENT CORP ET AL

NATIONSBANK CORP/FA

EDELSON JONATHAN MD

EDELSON JONATHAN MD

CAPITAL RESEARCH & MANAGEMENT CO

DIMENSIONAL FUND ADVISORS INC

NATIONSBANK CORP/FA

NORTHWESTERN MUTUAL LIFE INSURANCE CO

No description available