application		#level 0
  workbook		#level 1
    wooksheet		#level 2
    chart		#level 2
    window		#level 2

Q: how to refenecne an obj?
A:
Workbooks("a.xlsx").Worksheets("b").Range("C1")
excel_file_name_a.xlsx.table_b.cells_C1

Q: attribute of an object
A:
Range("A1").Value = 100
cell_object.its_value_attribute assign to 100

Q: how to use method of an obj?
A:
Range("A1:E5").Select
object.Select_method

Q: Range
A: 
Range("A10")
Range("A1:E5")

Q: Cells
A
Cell(2, 1)	#row_2 col_1
Cell(2, "A")	#row_2 col_A which is col_1

Input/Output scanf/printf
--
InputBox
MsgBox