Creating a .DLL for an Expert Advisor

 
I am sorry, but I cannot seem to find any instructions/tutorials for creating a .DLL for an Expert Advisor in MetaTrader 4. How can I find this?
 
See experts\samples\DLLSample - project for VC++ 6
Sample of using - experts\samples\ExportFunctions.mq4
Inlude file for import descriptons - experts\samples\include\sampledll.mqh
 
Thanks!