Breakpoints with C++

Hello 4chan, 7chan failed me in this..

I want to create my own debugger, like OllyDBG but as a injected DLL-file.
I have all functionality I want except for one; I don't know how to set/place breakpoints in the code..

My google-fu has failed me in this, if anyone could help me, please do! :)

Heh, I don't mean to brag, but I remember posting >>2 and >>3 almost two years ago. Brings back memories...