Ssdpsrv.exe is the file that starts the UPnP server on WindowsME boxes.
This service comes standard with the WindowsME installation.
The Ssdpsrv.exe server is started at boot.
Here is the registry entry:
KEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersoin\RunServices
Here is the file that starts the server:
c:\windows\system\ssdpsrv.exe
For information about UPnP go here:
http://support.microsoft.com/support/kb/articles/Q 262/4/58.ASP