What does it mean confirming (or not confirming) code segment? So what do the bit confirming if i have code segment?

If a code segment is conforming, that means that less privileged code is able to jump to or call addresses in this segment. I'm not talking about call gates or interrupts here, I mean using far jmp or far call to directly jump to a memory address anywhere in the segment. An OS normally leaves this flag disabled (clear).

thank you, me too i didn't understood this trick

Thanks. And one more thing: If i load a selector of a code descriptor into a data segment register, (and first bit of type is set (read/write [read/noread if code]), could i write to that segment without any problem?

i think it is impossible, as segment protection is done to avoid this possibility.

I've inserted a simple selfmodifier code in an executable, and i've changed the .code section parameters (windows) to read, write code segment from read only code segment. Also it used ds to rewrite the code. But i just want it to know if it is worked because of usage of other segment register then cs.