What is OCX?

What is OCX? OCX (Ole Control Extension) is an independent program modules, which can be accessed by other programs in Windows.
Now superseded by ActiveX control, but an ActiveX container (a program that can be "attached" by ActiveX) still support OCX, in other words, backward compatible. Examples of ActiveX container such as Internet Explorer, Wonderware InTouch.

How InTouch could recognize ActiveX / OCX?
 
ActiveX must be recognized by Windows first (registered).
 
How to register OCX:

Go to Run on the Start Menu, type:

regsvr32 (path or file name ocx)

for example: regsvr32 c: \ calendar.ocx

Once OCX is registered in Windows, InTouch will recognized the OCX.
In WindowMaker, select Special tab > Configure > Wizard / ActiveX Installation
Select ActiveX Control Installation tab. If ActiveX is already registered by Windows, it will appear in the ActiveX Control list. Select the ActiveX, click install.

ActiveX will appear in the Wizard - Installed ActiveX Control.