A unifrog point is merely a point that can act as either an electrofrog point (where the frog is live depending on the direction the point is set) or as an insulfrog point (where the frog is electrically dead, which can result in a loss of current, perhaps more noticeable with DCC and DCC sound locomotives with short wheelbases).
You can change the polarity of the frog via a switch on your point motor, either via an add-on to the PECO solenoid type or built in with one the Gaugemaster SEEP point motors (I forget which model).
If you are controlling the point motors by DCC decoder, instead of by wiring back to a control panel, then the connection can be made to the accessory decoder.