'Makes the specified process the current `active process`.
The handle can be an identifier returned by `Start Process` or
the ``alias`` given to it explicitly.
Example:
| Start Process  | prog1    | alias=process1 |
| Start Process  | prog2    | alias=process2 |
| # currently active process is process2 |
| Switch Process | process1 |
| # now active process is process1 |'

def switch_process(self, handle):

    self._processes.switch(handle)
