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tie() and untie() are described in PerlTIE Man Page
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These generate "enchanted" variables ( magical blessing!) which allows one to access what seems to be an ordinary variables in a Perl Program but behind the scenes, the implementation of variable dioes a lot of work which could include computation, data access etc.
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Examples in PerlTIE include:
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tie a scalar $priority which returns process or user priority by accessing UNIX system
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tie a hash to a database so that
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$tiedhash{lookupkey} returns value of lookupkey in database
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This latter tie is most powerful and could involve SQL access to the database sever when tied hash accessed
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