Update for Windows XP Service Pack 2

This update helps resolve an issue on computers running Windows XP Service Pack 2. Programs that connect to IP addresses in the loopback address range may not work as expected and you may receive an error message indicating you cannot establish a connection. After you install this update, you may have to restart your computer. For more information about this update, read Microsoft Knowledge Base Article 884020

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I doubt this will make it to Windows Update. It's only a specific patch for problems that should only occur on a (relative) small number of systems.

The MSKB articles you quote "fix" different files:

http://support.microsoft.com/default.aspx?kbid=817293

PHP:

.     Date     Time    Version        Size    File name
   -------------------------------------------------------
   22-Aug-2003  18:25  5.1.2600.1264  599,040  Mstscax.dll



http://support.microsoft.com/?kbid=884020

PHP:


.     Date      Time   Version        Size     File name
   -----------------------------------------------------
   13-Aug-2004  22:50  5.1.2600.2505  359,040  Tcpip.sys


The 1st one is about Remote Desktop Connection only, the 2nd "Programs" in general...