How can I run multiple instances of an app in netbeans?

Hi,
I would like to run multiple instances of an app in netbeans, this is essential when making GUI changes and you want to compare them with the older version.
Thanks in advance,

It is still true that Netbeans cannot launch the same project twice, even with the latest 7.2 and JavaFX Beta version. When trying to "run" the second instance, Netbeans tries to rebuild the project jar file but can't delete it because it is "locked" by the first instance.
For JavaFX projects, I start one instance by double-clicking the jar file (in the project's dist folder), then use Netbeans to launch the second instance. For comparing your app's old vs. new screens, save the old app version by copying the project folder to another place and use the double-click jar to launch the old app, then proceed to revise the new app version and launch it under Netbeans. That's how you run one version "outside" another version.

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