Attorney–client privilege is generally recognized by the courts. Communications between lawyer and client are generally immune from subpoena. In other words, a lawyer cannot be compelled to testify in a trial unless the lawyer becomes, or appears to become, a party to the litigation. A similar situation exists with "work product", meaning written documents or computer records generated in preparation for a trial or hearing. This includes information such as potential questions that may be asked of witnesses, lists of possible witnesses, memoranda, notes, trial strategies, written briefs, or documents that may, or may not end up being used in the course of litigation. Usually, none of this can be the subject of a subpoena duces tecum. If a communication between lawyer and client is made in the presence of the third party, the privilege is not recognized to exist.