GWT MVP ROO getBackButtonPlace()

can someone please explain what exactly is this? (in Roo generated GWT
MVP code, expenses app)

public Place getBackButtonPlace() {
return ScaffoldMobileApp.ROOT_PLACE;
}

i see it in all generated Activities.
why is there a reference to ScaffoldMobileApp ?
normal web/desktop applications use backbutton too,
why only mobile is in there ?

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