What's usage of handle parameter in wtp

What's usage of handle parameter in wtp SearchSearch
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Anonymous
Posted on Wednesday, September 17, 2003 - 10:31 am:   

in wtp spec, all primitives has the handle parameter. the spec said it's only local significance only, so i thought is really useless.
becoz there are tid assure the correctness of the linkage.
i can't understand the handle parameter. all i can figure out is that this parameter is supplement variable to the tid to simplify the tid.