如何在特定AIR应用程序上检测和调用用户的AIR运行时本地安装？

I am writing a program that has an AIR front-end, but a back-end written in another language (Python, in this case). Since AIR can't invoke other executables, the relationship has to be the other way around, with Python running an AIR subprocess. How can I locate the user's AIR runtime? I'd like to be able to do this on Mac, Windows, and Linux.I am writing a program that has an AIR front-en