Google translator im guessing...
Basically a hack is a compiled C++ dll that goes into the files in CShell and Engine and edits them to your advantage. This is injected into Engine.exe.
You dont need to alter any files. the hack should do it itself. And once you open Combat arms again (w/o hacks) it will be back to normal way.
A hack gets detected when Its overused or abused by people. This causes Nexon to catch on. A hack gets patched when an update is done. the addresses that the hack will change is altered in CShell and Engine causing the hack to alter the wrong stuff. [I wasn't sure what you needed so i explained the jist of it]