I am trying to simulate the operation of an optocoupler with a triac to trigger the triac using the AC current. I have come across a few circuits that are all similar: 

[![enter image description here](https://i.stack.imgur.com/5uPkK.png)](https://i.stack.imgur.com/5uPkK.png)

My question is regarding the connection of pin 4 of the optical isolator to the load as well as the gate of the triac. Shouldn't it be connected to the gate only? Doesn't connecting it to the load by pass the triac and defeat the purpose of using a triac? 

The configuration above works in the Multisim simulation but only because the current seems to be flowing through the 1k resistor; the triac doesn't switch on when I place an oscilloscope across it.