Concurrent Developer Testing in 12.1 Environment

We have been using 11.5 for quite a while and are now trying to learn the ropes with 12.1.
We often have multiple developers testing new changes to the same application at the same time on the same server. In 11.5 we basically did this by using standardized naming conventions in the file system. Different developers used different URLs to essentially get to different copies of the application for testing.
We are hoping we have some better options for concurrent development in 12.1. Does anyone have any suggestions? Is there any way to use NWDI to deploy different versions of the same application to the same development server such that they can be tested independently without doing a lot of renaming?
With our Java web apps (unrelated to our MII web apps) we just deploy .war files with different context roots and that solves most of the issues. Is a similar approach available in 12.1?
Thanks,
Mike

Hi Kevin,
Thanks for you response. This is somewhat helpful. but it does not give me a path forward Let me be a little more specific.
Let's say we have two developers working on the same project/application. Developer A is fixing a bug and developer B is adding a new feature. Let's assume we are using NWDI's sourece control. Let's also assume that the two developer do not need to check out the same files and that they are working on two different Activities. Let's say developer A is working on Activity X and developer B is working on Activity Y.
The question is, how do developers A & B test on the same MII server at the same time?
It typcially is more complex than this. Typically we have more than two developers testing at the same time and sometimes developers will work on the same Activities. In addition to this type of development/testing we typically have an integrated version of the application that we run on the same server at the same time as well. Typically a developer is working on what we call an SCR (Software Change Request). They are developed/tested independently and once they are finished/tested/verified they are merged into the "integrated" version. We currently have the ability to do all of this simultaneous on the same server (although we only have a crude way of doing it by using copies and a strict naming convention).
In the J2EE world this is easy. We can just delpoy the same .WAR files with different context roots and they run independent of each other.
What is the best way to handle this with MII 12.1/NWDI? I don't think it is reasonable to require one MII server per developer.
Thanks for your help.
-Mike

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