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The action of DIMing the variable makes its value NULL(Is that right?)




Thats right.

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If I pass a parameter like I did above, does the script consider it dimmed?




Yes and no. It considers it as GLOBAL, as if you had done this:

Global $somevariable

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If not how do I DIM it without losing its contents?




As far as I know you cant. Just assume command line $vars are Global.