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Use AssistiveTouch on your iPhone, iPad, or iPod touch - Apple Support
You can use AssistiveTouch to adjust volume, lock your screen, use multi-finger gestures, restart your device, or replace pressing buttons with just a tap.
When my iPhone or iPad is in the Spark remote controller I find it difficult to press the home button to access home screen or double press to switch apps.
The link above shows how to add a software home button to the display. Unobtrusive to the app being used.