netsnmp_register_watched_scalar Vs netsnmp_register_watched_instance

It was my understanding that

netsnmp_register_watched_scalar is used on the leaf nodes of a mib

and

netsnmp_register_watched_instance is used for the tabular handling of
the variable.

But the code in the example
(http://net-snmp.sourceforge.net/dev/...c-example.html)
uses the instance handler routine. Can someone correct my
understanding of these handler. Is there any literature that explains
the differences anywere?

Sorry if this question seems too trivial to some, The older guys need
to pass on their wisdom to the young....

Thanks
Sridhar

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