During game-play press F12 then type in the following codes and press 'Enter'
God Mode:
DIFRULES
Control All:
FULLCONTROL
Hands off Everything:
HANDSOFF
Defeats Everyone:
NOREVOLTS

Get Leaders:
LEADERSHIP

Get Money:
MONEY
Get Men:
MANPOWER
Get Transports:
TRANSPORTS

Increase Prestige:
PRESTIGE

Get Province IDs:
SHOWID

Lift Fog:
NOFOG

No Troops Limits:
NOLIMIT

No War:
NOWAR

AI accepts any peace proposals:
NEVILLE