[Duncan Booth]
>> Windows is only smart enough to avoid duplicate entries if you tell it
>> to do that. e.g.
>>
>> PATH c:\python25;c:\python25\scripts;%PATH:c:\python25;c:\python25\scripts;=%
>>
>> will add the two Python 2.5 folders to the head of the path without
>> duplicating them.

[John Machin[
> Wow .. I didn't know that! What's the syntax? Something like
> %variablename[:oldtext=[newtext]]%
> ?

Yup.

> Where is this documented?

>From a DOS box (cmd.exe), enter

    set /?
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