Hi michael,
As mentioned before,in WinNT and Win2k, all I/O must be doen thru Windows using APIs.

You could try the standard documented APIs, the use of which is easily available on the MSDN site at http://msdn.microsoft.com

Boondog.com is a very interesting site, and I am sure you'll find this page in their tutorials section very useful:

http://www.boondog.com/tutorials...ltutor.htm

However I find that these are rather unreliable when it comes to timing. The Windows OS totally takes over all critical timing functions, and your application is pre-empted by some damn internal processes. Hence I wouldn't recommend the standard Windows Timer Object. However I believe there ARE alternative dll's available for download on the net. Try a search on Google.

Also try a few embedded development links for more help.

kundi