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Date: Sun, 28 Dec 2008 20:11:03 +0000
From: Stewart Bryant <stewart@g3ysx.org.uk>
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Gary - G4WGT wrote:
> Stewart, Jim & LF,
> 
> I can recommend Dimension 4 saftware, I have it automatically set the PC
> clock every 15 minutes.
> 
> 73
> 
> Gary - G4WGT.
> 


"Dimension 4 uses one of a few well known and broadly implemented 
internet protocols to connect with publicly available time servers that 
have been operating on the Internet for over 15 years. These time 
servers typically have their very own atomic clocks, or are directly 
connected to other machines that do."

That looks like an NTP implementation to me. Most of these are a port
of the code written by Dave Mills' team at University of Delaware

http://www.eecis.udel.edu/~mills/ntp.html

NTP is free in XP, Vista, Linux, OSX and most other operating systems
I can think of.

Stewart/G3YSX