help needed with root oid and getnext operation

Hello snmp coders and users,

I'm lost please help shed some light.

I have an subagent which registers organization root oid (several tables and scalars)
when I run snmpwalk on one of the columns of one of the tables the
net-snmp master agent calls my handler with GETNEXT mode first
and then with GET mode.

my questions:
1 - what am I expected to return for GETNEXT call? Do I return the index of the next valid object instance
  or the actual value of the first valid object instance?
2 - if I'm expected to return a value as a reply to GETNEXT call, why then my subagent is called again with GET mode?
3 - if I'm expected to return only the index (modified oid?) of the next valid instance, do I modify the
 name field of the netsnmp_variable_list struct? 

4 - when snmpget command is called on one of the columns of a table do I return all the instances of that column? If so do
I create a list of variables by calling snmp_varlist_add_varibale() and return back the list? 

Thank you for your help 
Bernadette

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