1. Informal proceedings. Informally by the register on the application of any interested person when necessary to protect the estate of a decedent prior to the appointment of a general personal representative or if a prior appointment has been terminated as provided in section 3-609; and

2. Formal proceedings. In a formal proceeding by order of the court on the petition of any interested person and finding, after notice and hearing, that appointment is necessary to preserve the estate or to secure its proper administration including its administration in circumstances where a general personal representative cannot or should not act. If it appears to the court that an emergency exists, appointment may be ordered without notice.