Mar 10 - Using "que" to start a sentence.

I have a sentence in my book which reads "que pase el siguente" which means "let the next person come in" ,, Now I know that que is a conjunction and we can't grammatically start a sentence with que and whenever there is such a sentence there has to be some hidden implicit beginning which has been hidden to shorten the sentence. Example : "ojala que", "espero que", "te he dicho" etc. Now I am confused about what the implicit beginning of this sentence might be .. CAN ANY ONE HELP PLEASE .. Thanks