C++ javascript extension

Having researched the dreamweaver support documentation i discovered i could write an extension in c++. This could then be called as a javascript object. I obviously need this extra functionality. I am running an in house intranet website on an apache server. I was hoping this option would avoid the necessity to write an activex object. However i do not understand how this all works given that javascript is client side and obviously  clients in the network would be running javascript interpreters within their own browsers which could not have this extended functionality! Can anyone explain how this works and if it is appropriate for this usage? If dreamweaver allows extensions to javascript how can this be accessed/ deployed to clients. Thanks in advance for any support...