The softkeys are managed by the underlying S60 Platform. When no
dialog is visible, the right softkey is bound to application exit and
the left one represents an Options menu. Python for S60 offers
an interface for manipulating the menu and for binding the Exit key to
a Python-callable object (see Section 3.1.4).
The native code that implements a dialog also manages the softkeys of the
dialog, typically OK and Cancel. When the user input needs to be validated
before accepting it and dismissing the dialog, it is best to use
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