By default the telescopes will attain a sharp automatic focus before the telescope starts your data/image acquisition.
The systems will in most cases automatically slew to a nominated focus star of sufficient brightness and center it before focusing.
This should ensure a good auto-focus. iTelescope has implemented an algorithm for focus adjustments that check for ambient temperature changes.
But you can do a focus check at anytime during your sessions by selectiing the 'Periodic Focus' option as well.
See the imaging options in the ACP interface.