# 16:32 Bit Interoperability

The 32-bit implementation of OLE 2 is compatible with OLE 1 applications in the manner described above. Interoperability is achieved by converting calls made on objects in one model into calls suitable in another model. For example, if a call is made by a 16-bit application to an object that is a 32-bit implementation, the OLE 16:32 interoperability (thunk) layer takes care of marshalling and converting parameters between the two models.