In earlier times, exorcism was conducted using bell, candle and book. More recently a less religious procedure is applied where quite simply direct contact is attempted with the spirit.
On the basis that the spirit may be lost or confused and then remain in limbo, exorcists will invoke them and then direct them. That usually takes the form of the exorcist standing and pointing skyward at the same time as commanding the spirit to see the Light and then to go towards the Light so that they can be with their loved ones once again and be at peace.
The direction of pointing seems almost immaterial it many exorcists will not point to the sky but maybe towards a distant horizon.
This direct approach to troubled spirits is quite effective. Malevolent spirits are a little more tricky. Here, some sort of public forgiveness is helpful. That can be followed by the pointing procedure and perhaps a little salesmanship and gentle persuasion to the effect that all that they ever wanted is waiting for them at the Light.
It is known from the accounts of Near Death survivors that a bright white light will appear beckoning them towards.