Execute a program on Android with QProcess inside an APK

[lqsa]

I've a QT Android application (A) that needs to execute another application (B). The B application is packaged inside the A APK.

process = new QProcess(this);
  QString program ="B";
  process->start(program, arguments);

process = new QProcess(this);
  QString program ="B";
  process->start(program, arguments);

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What must to put on program variable to call B?

When the application was ported to iOS, will require any change?