I need a php program quite plain and simple.
I need you on my website to speak for char with visitors of other websites.
I mean. On another page I have to enter some kind of script, (here's an example: https://www.zopim.com/static/www_new/images/product/easy_setup.9c3d0a8dbd3c.png)
And I in my own website, I want to talk to visitors.
Additional (if not only complicates the program).: That I can call the visitor from your browser and I can receive the call in my browser. Example: http://www.subirimagenes.com/imagen-capturadepantalla-8541763.html
The program has to be very fast and fluid.
I'd rather not use any framework. I want a totally clean code and customizable, with many comments so it can be modified in the future.