As in the code used in the /L: command line option of setup.exe.
Extremely irritatingly this article has English US and lots of others but not english UK.
http://publib.boulder.ibm.com/infocenter/pcomhelp/v5r9/index.jsp?topic=/com.ibm.pcomm.doc/books/html/install_guide13.htm
I need the number code not the character code (en_GB)
Is it a constant, or is it specific to an application?