The optional Processing Clause allows you to gain control when the frame is first compiled. It is similar to the Retrieve Clause, with the following differences:
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Processing clauses can be used on fields larger than 64 bits, where Retrieve clauses can only be used on fields 64 bits in size or smaller.
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The Processing clause is executed only once and is always executed when the frame is first compiled. The Retrieve clause is executed only when the frame is displayed in the protocol analyzer and so is unpredictable both in the number of times it is executed and when it happens.
Processing clauses are most useful when you need to grab a value and save it as inter-frame data. You can string several Processing clauses together using the ALSO keyword, just as you can with Retrieve clauses.
The format of a Processing Clause is:
PROCESSING ProcessingMethod [ALSO ProcessingMethod …]
There are currently no standard Processing methods.