Thank you Mem. It was very helpful.
I have been successfully use Alarm.timerRepeat(1, DisplayTime) and it seems to work correctly. Showing "millies" is a great idea, thank you. I will add that to my code.
Within my routine, it fetches something from the network, Reading some huge file, and parse and filter what it receives. I have this done every one minute with Alarm.timerRepeat(60, ReadData). The problem is when the data is being read, the DisplayClock does not seem to be executed (Clock stops), for 10~20 seconds. When its done with the ReadData code, it goes back and show the clock every second and the time seems to be correct.
With in ReadData code, I am using Alarm.delay, client.connect and some other functions from Ethernet library.
The PulsePattern works on Timer1. I will give that a try.
Thanks again.