Running 3 Jupyter Notebook simultaneous from another Jupyter notebook

Question

Exist a way to run multiple notebook's simultaneous from another one?

ex: i can run another notebook using this

  %run ./called_notebook.ipynb
  foo()

but if i do this:

  %run ./called_notebook.ipynb
  foo()
  %run ./called_notebook2.ipynb
  foo()
  %run ./called_notebook3.ipynb
  foo()

the code run the first one and wait until end to run the next one,

i need that run the first, run the second, run the third and wait end of these three

its this possible?