Create and use of plugin

Dear all,

I am planning to write a program which runs with multiple plugin.

I have read a message on this board and found that I can use a function call "LoadLibrary" which can call external dll/exe file through my own application. Or, according to the same message, I need to write a plug-in interface for loading the plug-ins.

My application will be using the plug-ins to change the application forms and output. Custom plug-ins develop by user are also part of the functionality.

I guess a plug-in interface is what I am looking for but can anyone tell me, what is a plug-in interface or how can I develop one ? ( This might be a silly question but I am new in using plug-in )

Thanks in advance

Regards,

K Chu