Query on hierarchical tree in Oracle Forms

Few questions...

1)Can you please elaborate on the SELECT....START WITH....
CONNECT BY.. CLAUSE. which we use in creating Record Group
for populating Tree.

2)Moreover my EMP table has foll. structure.

 (FNAME           VARCHAR2(15),
  MINIT           VARCHAR2(2),
  LNAME           VARCHAR2(15),
  SSN             NUMBER(12) NOT NULL,
  BDATE           DATE,
  ADDRESS         VARCHAR2(35),
  SEX             VARCHAR2(1),
  SALARY          NUMBER(7) NOT NULL,
  SUPERSSN        NUMBER(12),
  DNO             NUMBER(2) NOT NULL) ;

How will i modify the above SELECT....START WITH....
query to populate tree item with my EMP table.Why normal SELECT statements are not effective here.

3)Suppose user wants to create the nodes manually without populating it from any table.How he shoould go about it???

I am using Forms [32 Bit] Version 6.0.8.11.3 (Production)

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