The code for an invoked by click console: (note - you can highlight the code and press ctrl+c to copy it)
 
<script language="JavaScript">
function invokedwindow()
{
window.open("nameofpopup.html", "window_name", "toolbar=no, location=no, directories=no, status=no, menubar=no, scrollbars=no, resizable=no, width=300, height=300, top=100, left=100");
}
</script>

You will need to create the link for the surfer to click to invoke the console like so:

<a href=#consoles onClick="invokedwindow()">Click Here To Invoke Console</a>

Breaking down the various parts of the code:
 
Here, the attributes you can change remain exactly the same as the ones you can set with a basic console. Please refer to this section under basic consoles by clicking here.

Where to place the code:
 
You can place this piece of script anywhere between your <head> </head> tags.

You will place the link invoking in somewhere in the body of your page.

A working demonstration of a basic console:
 
Example of an invoked by click console console.

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