Here is an example of colloquy, from an example transcript:
Q. Will you state your full name for the record, please, sir?
A. My name is --
BBBBBBBBMS. SMITH: Objection. The witness’ full name is irrelevant. You may address him as Mr. Jones.
BBBBBBBBMR. TODD: So I can’t ask him his full name?
BBBBBBBBMS. SMITH: That’s correct.
BBBBBBBBTHE WITNESS: That's right.
During testimony, "Q" is the examining attorney and "A" is the witness, but in colloquy, the witness is referred to simply as "THE WITNESS," with other participants in the conversation being referred to as MR. or MS. followed by their last name.
Colloquy comes from colloquium, from col-, meaning "together," and -loquium, meaning "speaking", from loqui ("to speak").