what is X'82' or X'80' ,what it represents i mean what value it will caontain when we will use this???
Each is a one-byte value. If some "data" contains these, that is what will be contained? I suspect you are asking somethiing else.
Where did you see these used (i've seen them used many, many times). Every time they were used they meant something to that particular bit of code, or control block, or data. Whatever the use is, it will be documented somewhere. Once you determine what you want to learn, someone may be able to help.