You could run all your applications from Eclipse. It's a fair bit lighter on your resources than Mendix.
There should be some documentation on running from Eclipse, yes. If you're unfamiliar with it, it's the default platform for extending Mendix with custom java.
It's all quite simple really:
Wait a bit for Eclipse to start your application. Also make sure the project isn't still running in your Mx modeler, or you'll get the obvious port-conflict.
You can install the Windows Mendix Service Console and run multiple applications from that, even using different runtime versions
If you're feeling adventurous you could use a batch script to start your Apps. For an example see here: https://github.com/ako/CsvServices/blob/master/lb/start-runtime-1.cmd
Note that this is not an officially supported way of starting the runtime, but for development purposes it should be fine.