SCETION ACCESS ?PLS URGENT?

[#1]

i have refered few documents but i have still confusion

how to do

1) row level security

2)sheet level security

3) document level security

4)coloumn level security

5)coloumn level security

6)object level security

PLS     very very  urgent  if u have  any qvw like above req individually   pls  send  me   tell me how  to do it   pls

[#2]

For the sake of consolidation, here's a similar thread that was just posted about section access (shocking, right?)

i have sheet1 and sheet2 when i login as user1 only sheet1 should be there and user2 means sheet 2 ?...

[vgutkovsky]

Robert is right--please consolidate, it helps everyone.

Vlad