Instead of JRun, Tomcat is embedded with a stand-alone ColdFusion installation.
Previous versions of the ColdFusion installer (before ColdFusion 10) offered a "multi-server" deployment option, whereas starting with ColdFusion 10, only a "server" deployment option is offered. Even so, after installing ColdFusion in server mode, users of ColdFusion Enterprise, Developer, or Trial editions can still create multiple instances and clusters with the Enterprise Manager in the ColdFusion Administrator.
For details, Installing Adobe ColdFusion.
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