ORAENV for Windows RAC Environments
ORAENV is missing on Windows Oracle environments so the ability to change environment variables like ORACLE_HOME is very cumbersome.
Below is a batch file which you can customise for your own Oracle RAC environment.
Once modified, just copy to %SystemRoot% on your server so it can be called from anywhere even from other batch files.
NOTE: There is also a version of ORAENV for single server environments.