Dear GLOBEX® Customers,

As part of CME's continued effort to improve monitoring capabilities in our market data environment, we are providing second and millisecond information for OneChicago contracts. This enhancement will provide better visibility into market data performance for OneChicago Single Stock Futures, as is currently provided for GLOBEX market data (excluding the MO message type). We are deploying this functionality into production on June 19, 2004.

This enhancement should be transparent to Market Data Application Programming Interface users as we will be utilizing previously reserved internal-only fields: 13 - 16. The change is currently available in our certification environment. Although this change is consistent with what has already been implemented for GLOBEX market data, we encourage all MD API/OneChicago customers to test this new feature prior to the release.

For more information, please see the MD API 2.X Message Specification document at www.cme.com/mdapi.

If you have additional questions or require access to our certification environment please contact your Technology Marketing Account Manager at 312-634-8700 or at TechnologyMarketing@cme.com.

Thank you,

Chicago Mercantile Exchange
Technology Marketing
312-634-8700
TechnologyMarketing@cme.com