Okay, I have another setting question, as I can't find an answer for in the books (yet)...
What kind of high-level technology exists in the Imperium?
Quite a lot of different kinds, though the focus is somewhat different to how we have it.
Are there any computers?
Cogitators, frequently seen in the presence of tech priests.
Light incense to appease the machine spirit within
Intone the ritual of awakening
Press the power switch
If the machine does not awaken, strike the first rune of blessing upon the casing and check the connection leads at the rear
Probably, but likely incorporated into dataslates, which would be along the lines of the tablets we have today.
Vox, both civilian and military
Astropathic, not technological