Rod,
I have a process that runs every minute.
When creating a new scheduling item, after entering the information on the scheduling tab, go to the Textual form tab and change the conditions to something like:
If CURRENT_TIMESTAMP>TIME_ADD(SystemSettings.ProcessLastRan,1/60) Then
YourProcess
SystemSettings.ProcessLastRan is a TimeStamp that gets updated to the CURRENT_TIMESTAMP in YourProcess.