Client memory positions

I'm posting this again because somehow it didn't go last time.
In the file ProcessStream.cs it gets a handle to the Client process and use ReadProcessMemory( m_Process, m_Position, p + offset, count, ref res ) to access its memory. Everything is clear except for m_Position and p+Offset. Does anyone have documentation on where everything is layed out in the Client's memory?
Again thanks a lot
Li-ion