From Forum Nokia Wiki

This article has provided a very good explanation on the uses of a DEF file. Provides good information on its usage in building Symbian DLLs. If not understood properly you might spend too much time building and debugging your DLL without any valid reason. This article really helps in clarifying many things one might want to know while building a DLL.

--Kamalakshan 19:48, 6 September 2009 (UTC)