Extension-pointer is a four-byte field that specifies the address of the first or only DBCAREA extension.
|In this language...||The variable name for Extension-pointer is...|
|This routine...||Takes the action for Extension-pointer...|
|DBCHCL||reads (IRQ; IWPF)|
|Extension-pointer is used by...||To...|
Each extension applies only to particular functions, so care must be taken to address the proper extension before invoking a function and clearing the Extension-pointer when that function is complete.
For more information about DBCAREA extensions, see DBCAREA Extensions.