Question about netsnmp_table_row_register(...) API

Hi,
I am planning to use this API to register the rows of the udpTable from multiple subagents in AgentX implementation.
 
I am looking for some help with the usage of this API.
 
int
netsnmp_table_row_register(
netsnmp_handler_registration 
*reginfo,
netsnmp_table_registration_info 
*tabreg,                          
 void *row, 
netsnmp_variable_list *index)

I am quite clear about the arguments: *reginfo, *tabreg and *index.
I think that *reginfo is created by: netsnmp_create_handler_registration( )  and
*tabreg is created by:
netsnmp_table_helper_add_indexes( ..)
 
Can someone help me in understanding the argument  (void *row).  How do I create it ?  what should be its value(s) etc.
Any pointers to example code will be greatly appreciated.
 
As new UDP sessions are created in different subagents,  I want to populate those in the udpTable with address and portNumber.
 
Thanks,
Zaryab

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