How can I get informations about PATH variable ?

I have a programme installed on my computer and I need informations about its path. For example I can get Java home path like this:
System.getProperty("java.home");, but how can I do that for my programme.
If you know another way I can do this please let me find out.
Thanks !

To sergey35:
Thanks! This work very well.
Now I want to launch an application from java, but I don't know how can I test if my application exists (is installed).
For example if I want to launch winamp or any other application, but how can I verify if my application exists indeed. The end user isn't interested if my application really exists. He push a button and he wants to launch that application. If it doesn't exists I have to notify through a message this fact. And most difficult I think is to know exactly the path where is installed that application.
If anyone can help me with documentation or suggestions please reply to this thread.
Thanks!

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