title: Call Excel COM Addins functions using macro
body: <p>How can I call a function defined in a COM Addin using excel macro ?
  Basically I have created a Excel COM Addin which does some bunch of stuff.
  Now I want to invoke this via excel macros.
  Is it possible to do it ?</p>
  
  <p>Or</p>
  
  <p>Is it possible to install COM Addin using a macro ?</p>