The answer to that depends on what the program is designed to do.
Most subliminals do not induce a trance or any other altered state of awareness, except perhaps in terms of causing you to think and maybe dream about what the goal of the program is.
However, it is possible to induce an altered state of awareness, including a hypnotic trance, through a subliminal audio. This is useful for very high speed impact subliminals, and can be found in some (but not all) of my offerings that are intended to work in hours or minutes.
Triggering an altered state is useful for some things, but not for others. It is never something we do in an unsafe manner, and where it affects the ability to focus, there will be warnings in the subliminal instructions and in the description of the program.
Posted in: Using Subliminals