W32Time (Windows Time Service) changes Win2k => XP

I have found that the Windows Time Service registry key values have changed from Windows 2000 to Windows XP. The main key/subkey is unchanged:

However, in Win2K the default values under Parameters are apparently:
While in XP Pro, the default values under Parameters are apparently:

My utility errors on Windows XP when it attempts to read the Period value - that does not exist. I've been hunting online, and it appears that for Windows XP the period value is specified differently:
System Key: [HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesW32TimeTimeProvidersNtpClient]
Value Name: SpecialPollInterval
Data Type: REG_DWORD (DWORD Value)
Value Data: Seconds in Decimal

My question is this: must I use SpecialPollInterval on Windows XP? Or, if I create the Win2K values myself, will the Windows Time Service work correctly on XP? Can anybody point to good, definitive documentaion on the defined [required and optional] values for the W32Time key in XP?
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