The use of meta tags in data source specifications is by default enabled in Tango. The passThroughSwitch option controls whether meta tags (such as <@POSTARG>) are permitted in all fields when connecting to a data source using an application file. If this switch is disabled, all data source parameters--type, name, database, user name, and password--must be hard coded.
A system scope value of off for this configuration variable overrides an application scope value of on. For more information, see "Tango Applications" in Chapter 24 of the User's Guide.