Two another links for sample Delphi code:

http://delphi.about.com/cs/adptips2001/a/bltip0701_4.htm
http://www.clubedelphi.net/artigos/Versao_AplicativoDLL.asp

The last in Portuguese :-)

see you !

--
Alexandre Benson Smith
Development
THOR Software e Comercial Ltda
Santo Andre - Sao Paulo - Brazil
www.thorsoftware.com.br