Synchronized Deployment N'Run

System

I have a rather complex deployment definition I'm trying to hash out. I have the scripts that I need to run before and after a deployment working well. However I need to also deploy these files before and after the main deployment.

Script 1) de-register and shut down and COM+ applicaiton
Script 2) install new DLL and start COM+ application

So what I have is 4 definitions

1 - the content - this is fine it just needs to go before the component update

2 - the script that de-registers the COM+ application so that step 3 can succeed

3 - the DLLs

4 - the script that registers the new DLL(s)

Now, I thought about just having 1 and 3 and then doing something within 3's DNR ... the scripts could be deployed with 3, but I couldn't figure out how to ensure that script 1 was deployed and ran, then the DLL(s) where deployed then script 2 is deployed and run ...

So I broke it up into 3, however I think each definition is executed asynchronously.

Is there a better way to do this? Is it possible to have a chained deployment in one definition file?

Thanks,
Adam