List all API’s being used by a Windows App/Dll
Dumpbin /imports SomeDll.dll > APIList.txt
Dumpbin /imports SomeExe.exe > APIList.txt
So next time if you find some application that looks and works cool and you would like to know what all API’s that application is using, go ahead use dumpbin or Dependency walker( The first pane to the right list’s all those API’s ).
Using Dependency walker is much better since you can scroll through the list.