Setting Oracle environment variable using batch (.bat) file in windows

Oracle 9i db
Windows OS
I am in process to create the database (Considered that Oracle9i software is already installed) by running one batch file which consist of all the scripts for the database creation.
But i also want to set the environment variables at MyComputer(right click)>properties>advance>environment, permenently by running the batch (.bat) file
So, how can it be done ?
With Regards

*@echo off*
set ORACLE_SID=iprsdb
set ORACLE_BASE=C:\oracle
set ORACLE_HOME=C:\oracle\ora92     
call C:\install_bkp\test_env_var.bat
echo Test Successfull.
Above mentioned is the code written in the batch (.bat) file
In that i have also called another .bat file which test the env. variable values which is as below:
Testing oracle sid
Testing oracle base
Testing oracle home
Test Successfull.
But when i checked at MyComputer(right click)>properties>advance>environment variables
there, I saw none of the entries from the above, why so ?
how to set env. variables permanently using the DOS commands. ?
With Regards

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