Catching outputs from functions called in vizact.ontimer()

[Notch]

How can I capture the outputs from a function called using the vizact.ontimer() function? I understand that I need to define the name of the function I want to call, and pass any arguments in to the function following that; eg:

vizact.ontimer(0,myFunction,input)

...But I don't know how to get the outputs of myFunction. How do I do this?