What should an agent return if the object doesn't exist?

Right now our MFD based agent returns MFD_SKIP if an object doesn't 
exist, and that's gets translated by net-snmp into a value being 
returned who's type is, SNMP_NOSUCHINSTANCE (which is really 
ASN__CONTEXT | ASN_PRIMITIVE | 0x1). This seems correct according to the 
RFC (A snippet follows).

   This works just fine as long as I'm using net-snmp. When one of the 
guys here implemented an agent for Windows, there is an event (I forgot 
it's name) called something-NOSUCHINSTANCE that equates to the same 
value as SNMP_NOSUCHINSTANCE (0x81), but if the Windows agent tries to 
pass it to Windows snmp service, it promptly converts it to an error, 
and GETNEXT requests stop coming down. The Windows agent he coded for is 
the standard service that comes with Windows OS.

    I'm not meaning to ask a rhetorical question, but is Windows that 
brain dead? What is the proper behavior here???

    Thanx, tom.c

/Each variable binding is processed as follows:

  1. If the variable binding's name exactly matches the name of a
     variable accessible by this request, then the variable binding's
     value field is set to the value of the named variable.

  2. Otherwise, if the variable binding's name does not have an OBJECT
     IDENTIFIER prefix which exactly matches the OBJECT IDENTIFIER
     prefix of any (potential) variable accessible by this request,
     then its value field is set to `noSuchObject'.

  3. Otherwise, the variable binding's value field is set to
     `noSuchInstance'./
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