Hi there, 
currently when my participants reach the end of their task, it takes them back to the programming page, and they just see a bunch of code. Is there anyway to program the task so when they reach the end it goes to a blank screen / something that says "this is the end of the task, wait for the experimenter" ?
Any advice is much appreciated :) 
Stefania 

Sure. You can simply run a <trial> at the very end that displays a message of your choosing. Or you can create a simple instruction <page> like

<page endmessage>
^This is the end of the task, please wait for the experimenter.
</page>

and display it via your script's <expt> elements' /postinstructions.

<expt>
/ postinstructions = (endmessage)
...
</expt>