Win32 Environment Variable Read-only?

[L. Neil Johnson]

Using AS Perl 5.8.7 under W98SE, the PATH environment variable is 
displayed, then assigned a new value; but the new value doesn't propagate 
back to the MS-DOS %PATH% variable. Are the %ENV values read-only?

  C:\Programs\PERL>SET
  ...
  PATH=C:\WINDOWS;C:\WINDOWS\COMMAND;C:\PERL\BIN\;C:\THINKPAD
  ...

  C:\Programs\PERL>perl
  print "$ENV{PATH}\n";
  $ENV{PATH} = 'C:\WINDOWS;C:\WINDOWS\COMMAND';
  print "$ENV{PATH}\n";
  ^D
  C:\WINDOWS;C:\WINDOWS\COMMAND;C:\PERL\BIN\;C:\THINKPAD
  C:\WINDOWS;C:\WINDOWS\COMMAND

  C:\Programs\PERL>SET
  ...
  PATH=C:\WINDOWS;C:\WINDOWS\COMMAND;C:\PERL\BIN\;C:\THINKPAD
  ...

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