How to add environment variable programmatically??

Hi all,
I want to add TOMCAT_HOME environment variable programmatically. How can I do this?
Is there any dos command to set an environment persistently?
Pls help guys...
Thanks in advance
Mithunk

The way environmental variables work is that they are passed to newly created tasks by the task that creates them. So, for example, when a command shell calls Java it passes a copy if it's current environmental variables, and if Java calls Runtime.exec it can override the set it passes on.
The comands within a shell that set environmental variables can do so because they are part of the command shell, not separate programs run by it.
In short a program run by a shell can't alter the environmental variables belonging to the shell. They move only from the calling task to the called.

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i
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http://blogs.msdn.com/b/tconte/archive/2007/01/18/programmatically-adding-web-parts-to-a-page.aspx
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Please remember to mark your question as answered if this solves your problem

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