Tomcat does not have to set catalina_home environment variables

We typically use Tomcat to set a catalina_home environment variable.

But if we're going to have multiple tomcat on our machines, there's no way to do that.

But we can add this file to Tomcat's Startup.bat.

Setlocal
SET Catalina_home=f:\tomcat9\apache-tomcat-9.0.0.m18-windows-x64\apache-tomcat-9.0.0.m18
REM Guess catalina_home if not defined

Add set catalina_home=f:\tomcat9\apache-tomcat-9.0.0.m18-windows-x64 in the middle of setlocal and REM Guess catalina_home if not defined \apache-tomcat-9.0.0.m18 on it.