| _telkey | Unique identifier of the case; this is the case "number". It can contain up to 64 characters, including only letters and numbers. |
| _proj | Name of the project to which each case is associated. |
| _demo | Binary flag (0|1) indicating whether a case was opened in demo mode. Obsolete. |
| _lang | Language in which the most recent displayed page was shown. This is a two-letter code. |
| _typeint | Type of interview. See the Survey type pound instruction |
| _cetordre | List of questions in the questionnaire, ordered for this case based on PERMUTATIONs. This list is created when the case is first accessed. It is deleted if the questionnaire is re-compiled with a structural change. |
| _cedossier | Encoded value of the _telkey. It ensures that the _telkey information stored in the HTML page has not been tempered with. |
| _cetecran | Name of the question most recently displayed. For multi-question pages, it is the name of the first question on the page. |
| _h1 | String of date-time values documenting each time the questionnaire was initially opened in the callweb module. The system variables _date and _hour are derived from _h1. |
| _h2 | String documenting the cumulative duration of each session in the callweb module. It is expressed in seconds. The system variables _seconds and _minutes are derived from _h2. |
| _h3 | String of date-time values documenting each time the case was modified in cwnav. |
| _prepops | String of date-time values documenting each time the case was affected by a prepopulation operation. The system variable _lastprepop is derived from _prepops. |
| _verrou | Date-time value indicating when a lock was last taken on the case. This works in tandem with the Seconds locked pound instruction. |
| _telephone | Prepopulated telephone number, for CATI purposes. |
| _gmtoffset | Time zone of the prepopulated telephone number, expressed in hours from Greenwich. |
| _cetappel | Data structure documenting each call made in CATI mode. |
| _stock | Date structure containing a variety of information on the case such as the permutation order for response categories. |
| _dernierprepop _lastprepop | Most recent prepopulation date-time. See _prepops above. |
| _date | Date of the most recent access to the case. See _h1. |
| _week _semaine | Date of the most recent access to the case expressed as a week date. See _date and the week_start installation option. |
| _heure _hour | Hour of the most recent access to the case. See _h1. |
| _minutes | Total duration, in minutes, of all accesses to the case. See _h2 above. |
| _secondes _seconds | Total duration, in seconds, of all accesses to the case. See _h2 above. |
| _nappels _ncalls | Number of calls documented in the CATI call history. See _cetappel above. |
| _res | Call result code of the most recent CATI call. See _cetappel above. |
| _dateappel _calldate | Date of the most recent CATI call. See _cetappel above. |
| _heureappel _callhour | Hour of the most recent CATI call. See _cetappel above. |
| _tempsappel _calltime | Date-time of the most recent CATI call formatted as YYYYMMDDHHMMSS. See _cetappel above. |
| _interviewer | Name of the interviewer who registered the most recent CATI call result. See _cetappel above. |
| _daterv _appdate | Date of the appointment set on the most recent CATI call. See _cetappel above. |
| _heurerv _apphour | Hour of the appointment set on the most recent CATI call. See _cetappel above. |
| _commentaires _comments | Comments left by the interviewer on the most recent CATI call. See _cetappel above. |