Sinn Fein Education Minister John O'Dowd and the finance minister Mr Wilson engaged in sharp exchanges as well, according to insiders.

BBC: Robinson and McGuinness meet amid DUP-Sinn Fein tension

It was a big jump from hard-core technical books with titles like Applying RCS and SCCS, to Parisian guide books, but as a sole owner O'Reilly was able to finance his dream.

FORBES: Private business