explain the modify directive


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6:41:26 AM PST - Wed, Feb 20th 2013
Hi everyone,

I see the following line in NWchem examples:

modify atom 7:Na initial type Na final type K

modify atom 7:Na set 3 type K

Could anyone give me a detailed explanation on above two lines? Particularly on the meaning of "initial" and "final" and the "set" concept?

Thank you.

Jingbo