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ABL Reference
Class Properties and Methods Reference : Mode property
 

Mode property

Returns an instance of Progress.Reflect.ParameterMode that indicates the access mode for the parameter (e.g., Input, Output, etc).
Data type: Progress.Reflect.ParameterMode enumeration
Access: PUBLIC Read-only
Applies to: Progress.Reflect.Parameter class
Note: For parameters with a DataType property value of Buffer, this property is always Input.