EJB transactions: going deeper

In below article the autor explains in some words how works EJB technology, particularly about EJB transaction management
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@Stateless  
public class MyFirstEjbBean implements MyFirstEjb {  
  
  @EJB  
  private MySecondEjb other;  
  
  public void firstEjb(){  
  
    other.secondEjb();  
  }  
}  
  
  
@Stateless  
public class MySecondEjbBean implements MySecondEjb {  
  
  public void secondEjb(){  
  
  }  
}