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undef $^E;
undef $!;
...
print "dollar caret E reports          $^E \n";
print "dollar Exclamation mark reports $!  \n";
print "dollar question mark reports    $?  \n";

using system
System error 85 has occurred. The local device name is already in use.
...
dollar caret E reports          The pipe has been ended
dollar Exclamation mark reports
dollar question mark reports    512