The portable and preferable way to set an environment variable for the current process, and any children spawned thereafter: 
$ENV{HDS_TEAM_HOME} = "C:\\BATC_APPS\\Team_Flight";

[download]

On Windows, the shell (CMD.EXE or COMMAND.EXE) does not communicate behind the scenes, as Un*x shells often do. To alter environment variables for unrelated processes, you have to poke values into pseudo-registry keys. Check out CPAN for Win32::TieRegistry and the docs should help.

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In reply to Re: Modifying Win2K environment variables by halley
in thread Modifying Win2K environment variables by Anonymous Monk

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