reuse existing command when adding a datafile

I am running oracle 10g on windows server 2003.  When you are adding a new datafile, what does the command "reuse existing" do?  
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Reuse command link an exisiting datafile on a file system that is not linked to any tablespace in the database to a tablespace.

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PsychoDazeyAuthor Commented:
Im not sure I follow...what would the command:
    ADD DATAFILE '/u02/oracle/rbdb1/users03.dbf' SIZE 10M reuse existing
Here is a site that can help you with an example and explanation.
PsychoDazeyAuthor Commented:
I basically I would have to first drop that file then add it using the reuse command?  Thanks for your help again.
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