It means that your experience of life is something that emerges as it unfolds, where the person has slight power of steering this process that is quite deterministical because of pre-occurring conditions, but nevertheless steerable by virtue of the will. I believe that, and see that it is a belief.
A lot of people in the valley and CS see people as evolved computers, but there is no real evidence to support that. We are not good in mathematical calculations, we are not deterministic machines. We are very different from the computers that we make. It's quite unscientific to see the human mind as a computer. Unscientific in that it isn't supported by evidence. It is actually more of a belief or techno-religion. Most people that believe it see it as "the truth".