Need to write/delete a file (token) to/from user's home directory

I want to build a class that runs on Windows/Unix clients. It needs to get to users' home directories (both environments) and write the token on login, delete it on logout.
What method (or code snipet) would get a user's home directory?
What method (or code snipet) would write/delete a file from it?
Thanks much

Even if you are not writing an Applet, this is applicable. But I thot if you were, you might need this.
See 'SignedAppletDemo.java'
http://developer.java.sun.com/developer/technicalArticles/Security/Signed/

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Need to write/delete a file (token) to/from user's home directory

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