"shall" is traditionally used in formal or official instructions, rules, regulations, etc. It is seen as carrying greater authority and force than "should".
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Seung Chul Go1. In this case, what does technically "shall" mean?It's close to "must" or "is obligated to"
Seung Chul Go2. Would there be any difference if "shall's are replaced by "should"?Yes. Should means "it would be a good idea to."