ActiveX Dll

whats is the difference between DLL and ActiveX DLL?

An "ActiveX DLL" contains COM automation objects. The services such a DLL
provides may only be accessed via automation methods and properties on those
objects.

A "traditional DLL" provides a set of functions which are accessed
individually and directly, without the overhead involved of the COM
automation marshalling requirements etc etc.

In the "old days", trad DLL's offered a potential performance advantage over
an identical Automation DLL approach, but the difference given today's
hardware is negligible to the point of being irrelevant. However, "trad
DLLs" offered no way to "discover" waht services they provided, other than
through documentation supplied by the DLL author or vendor.

Since an "ActiveX DLL" is actually a COM server, it involves a type library,
so allowing "clients" to discover it's services easily.

can you tell me what is the exact meaning of in-process and out process

is activex exe in proces or out process

ActiveX Exe runs out of process.

In-process DLL components instantiate objects that run within a client application’s process space and become extensions to the application.

Out-of-process EXE components instantiate objects that run within their own process space yet provide services to a client application.