WHAT IS ROLE OF ETT field

"Raman Singla" <[email protected]>
Newsgroups gmane.network.ethereal.devel
Message-ID <[email protected]>
Hi all,

Kindly tell me the role of of ett field. 

It is usred in when we are creating the subtree from item e.g.

proto_item_add_subtree (subitem, ett_**);

Could any one please tell me the role of having an ett field here, whereas if i give any ID it also works.

Why we require ett_field. (Expansion & filtering still works if i don't give ett field in subtree). Can we skip ett fields & if we do what will the effects ?

Kindly let me know ?

regards,
raman

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