According to Lexicarnum:
Process
The host must first be inscribed with certain marks, runes and wardings to prepare it for the entrapment of a daemon. The sigils involved are largely unknown, but an essential rune called the
"Rune of Voiding" must be inscribed on the chest of the host in order to empty it of any previous souls so that the daemon can be effectively contained. Apparently, this rune is sometimes ignored, as in certain occasions, the original host's mind endured. Radical
Inquisitors with the resources would also string the host with chains, padlocks, amulets, and other bindings as to ensure the daemon's obedience.
Once all the preparations are made, the Incantations of Binding, the Litany of Servitus, and the Wards of Entrapment must be spoken, along with the final sealing words:
"In servitutem abduco, I bind thee fast forever into this host." Note that only these were mentioned by
Inquisitor Eisenhorn in his logs, and that other rites might have been involved.
If not all of the special preparations have been made, i.e. a hasty on-the-spot binding, the severe trauma of the process might inflict the daemonhost, ensuring that it remains docile and unresponsive for several days.1
I voted for the fist one, but I admit the holds are being a blast so far 
