How do I tell MSTEST to run all test projects in a Solution?

I need to know how to tell MSTEST to run all test projects in a solution file. This needs to be done from the command line. Right now I have to pass it a specific project file, I'm trying to get it to run from a SOLUTION file.

I'm hoping this is possible, because in Visual Studio, hitting Ctrl+R, A, runs ALL tests in the currently opened solution.

The way I've interpretted the help files, you have to pass in each DLL specifically.

I want to run this from the command line from my CruiseControl.NET server, so I can write other utilities to make this happen. If there is a wierd way of getting this to happen through some OTHER method, let me know.

How do I tell MSTEST to run all test projects for a solution?

<exec>
    <!--MSTEST seems to want me to specify the projects to test -->
    <!--I should be able to tell it a SOLUTION to test!-->
    <executable>mstest.exe</executable>
    <baseDirectory>C:\projects\mysolution\</baseDirectory>
    <buildArgs>/testcontainer:testproject1\bin\release\TestProject1.dll 
    /runconfig:localtestrun.Testrunconfig 
    /resultsfile:C:\Results\testproject1.results.trx</buildArgs>
    <buildTimeoutSeconds>600</buildTimeoutSeconds>
</exec>