Indirect Storage (STO IND) ELI5 what and why?

[DM48]

RCL 01
"Exit"

I cleared R01. Seems to work as desired. :facepalm:

I am trying to write a program that ask how many points you have (x,y) and then runs a loop so you can enter each point, and after the loop is complete, runs some calculations with the points. I plan on storing the y and x registers as complex numbers so I can pull them out for calcs easy. (After I have this program running, I will try the same using a [X x 2] matrix for storing the numbers and recalling them from the matrix.

I am trying to make it user friendly for myself. This is what I have so far. I believe Indirect Addressing is what I need to store point one in R01, point two in R02, etc.

Code:

00 { 150-Byte Prgm}
01 LBL "Area"
02 CLMENU
03 "#PTS"
04 KEY 1 GTO 05
05 "Go!"
06 KEY 2 GTO 15
07 "Exit"
08 KEY 6 GTO 99
09 MENU
10 STOP
11 CLMENU

12 LBL 05 #Stores the number of points to be entered
13 STO "A" #Number of points
14 CLA
15 "# Points = "
16 ARCL ST X
17 AVIEW
18 CLX
19 GTO "Area"

20 LBL 15
21 1
22 RCL "A" #Number of points
23 1000 #Create fff from number of points to be entered
24 ÷
25 +
26 STO "COUNTER" #Loop count variable
27 1
28 STO "R"
29 CLX

30 LBL 20
31 VIEW "COUNTER"
32 PSE
33 "Point"
34 PROMPT #R/S to continue without a second ENTER
35 X<>Y
36 STO IND "R" #Store complex number into R01, R02, increases every loop
37 1
38 STO+ "R"
39 CLX
40 ISG "COUNTER"
41 GTO 20
42 CLA
43 "Done"
44 AVIEW

45 LBL 99
46 EXITALL
47 END