If you have installed WSH 5.6 you should have the docs in your start menu. If not, then D/L the docs.

http://msdn.microsoft.com/library/default.asp?url=/downloads/list/webdev.asp

The dictionary object is an associative array where you specify a "Key" and a value such that you can have:

$Fruit("apple") = "washington"
$Fruit("cherry") = "bing"

but you could change the value such as
$Fruit("cherry") = "RED"

But there is a problem with the object and you need to remove an existing key and then readd the key/value. hence the mysterious lines you questioned. that sample was from another post where the user wanted to replace a value.
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