Method 1). You need the .lib file which comes with .dll, and link your program with it. If it's written in another language, you need to examine exported routine names using dumpbin /exports or "Dependency Walker", and write INTERFACEs to routines, with ALIAS attribute.
Method 2). If you don't have the .lib, you can use "dynamic binding" with pointers to functions. Search this Forum for "GetProcAddress" -- there should be a plenty of samples (one CVF sample from AdvancedDll also demonstrates that, or see
MAPI module on my home page).
In any case, you have to know routine prototypes (calling convention, return value, number and types of arguments) so that you can write INTERFACEs correctly, thus you need at least a piece of suitable documentation for the dll itself.
Jugoslav
