$show is a variable vbulletin uses to determine whether something should be shown. All the permissions for the forum and the user are looked at and then it is determined if something should be 'shown' for that user. If it should, it is set to true. If not, the default is false. If the code needed to determine if $show['whatever'] is not present to set that variable to true, it will stay at false. If you don't care about that variable, then just don't use it.
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