-- Hewlett-Packard Co. -- HP has assembled information on its DST and patches for its products at a special Web page.

-- IBM -- Details about the DST changes for a wide range of IBM products can be found at the vendor's special DST Web site, along with more specific information about problems related to Sun's Java.

-- Microsoft Corp. -- The new Windows Vista operating system already includes the updated DST rules, but earlier versions of Windows will need to be changed. For Windows XP Service Pack 2, Windows Server 2003 and Windows Server 2003 Service Pack 1, Microsoft released a single global time-zone update, which will include updates for the U.S. time change. A detailed summary of the effects of the DST changes on Microsoft products is available at the company's Web site.

Earlier versions of Windows, including XP SP1 and NT 4.0, are no longer supported, but can be patched manually using Microsoft's tzedit.exe utility. That allows administrators to create and edit time-zone entries for the Date/Time settings in the Control Panel. Other affected applications include Windows Server, Windows Mobile, Windows SharePoint Services, Exchange Server, Office Outlook, Dynamics CRM, Biztalk Server and Entourage, according to the company.

The most recent DST patch, released last week, is for the Microsoft Dynamics CRM 3.0 application.