I always wonder about high actions counter for one of my web page, based on actions counter in "Real Time Visitor Count". I have on one of my web page with relatively small number of visits (say 4), relatively high actions counter (even 15) for observed period (5 minutes). First I check this number against live log, then I check actions counter with proper sql query in database. I found that currently shown action counter is:

"sum of actions for visits active in observed period".

That would show wrong actions counter with included actions belonging to last visits, but are older than observed period (time parameter). Not all actions in last visits are eligible for counting in action counter, but only "younger" than observed period.