while installing the web server install the two servers with different ports for startup and as well as for shutdown port.. if both of them are different .. both the server will work fine it seems .. and while using corresponding port number should be used in the url.
second is write to u'r pc enviroment variable to CATALINAHOME : c:TOMCAT JAVA-HOME : C:JDK... CLASS-PATH :C:TOMCATCONFLIBservlet_api.jar; path :c:jdkbin; third step :c:tomcatconftomcat-user.xml change to user role