We're changing our real-time quote streaming to Lightstreamer.

My problem:
Some fields that belong to this minute can't be merged with same fields of the next minute.
When the minute changes, current state of these fields must be delivered to clients.

Any idea of how to do this ?

Is there any kind of control over the MERGE operation ?

What is the preprocessor ? Are there any docs about it ?

We're afraid of changing from MERGE to DISTINCT mode and fall into bandwidth problems.

thanks in advance.