table retrieval in "session" or in "transaction"

Hi,
     I want to implement snmp sub-agent to my application, which manages some group of processes (tells them to reconfigure, startning or shutting down them). In Snmp I imagine one read-only process table which will contains current information about managed processes (proc code, process name, status and some description).
     I've already had working solution. As I read tutorial I used table_iterator API. Everything works fine, but at this moment I have static internal process table (static means that no changes is made all the time). But as I explains above I need to handle this problem with table which is dynamically changing. But I am unable to determine when some snmp client begins to read my table and when this client finished it's retrieval. I receiving only events in "get_first_data_point", "get_next_data_point" and in table handler.
     When I use "snmp_table" to retrieve my table,  for every row "get_first_data_point" handler is called firstly and secondly "get_next_data_point" is called n-times where n is number of currently retrieved row. Finally my table handler is called. In this scenario I am unable to distinguish if somebody run snmp_get or if only some row is obtaning during snmp_table run.
     So I want to ask you if there is any way how to get information about begin and end of the table retrieval or if there is some workaround?

     Thanks and have a nice day, Jiri Humpolicek

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