running specific target in different ant scripts in different directories

Question

We have a large amount of apps. They all have a build.xml file located in the projects base directory. I am trying to create an ant script that will go through

Answer 1

Is it possible to run the target in the all the build files concurrently ?

E.g.

In this example, is there any way to run target "test" present in all the build files (one/build.xml,two/build.xml,three/build.xml,four/build.xml) concurrently ?