The RealtermWrapper ActiveX/COM is a .NET assembly that allows Internet Explorer/JSCRIPT to see Realterm ActiveX/COM Events.
We don't know why Realterm itself doesn't work, so the wrapper is a workaround for it.

The wrapper should have be installed and registered in the realterm installer. (V2.0.0.70X)

To register it:
cd c:\Windows\Microsoft.NET\Framework\v2.0.50727
RegAsm.exe "c:\program files\bel\realterm\wrapper\realtermwrapper.dll" /codebase

or on 64 bit systems:
RegAsm.exe "c:\program files (x86)\bel\realterm\wrapper\realtermwrapper.dll" /codebase

to unregister it:
cd c:\Windows\Microsoft.NET\Framework\v2.0.50727
RegAsm.exe "c:\program files\bel\realterm\wrapper\realtermwrapper.dll" /unreg