A specific instance of an OpenDCL control or form can be identified either by its handle or as a series of strings identifying the project, form, and control names for the specific control. The OpenDCL documentation uses the convention of specifying <CONTROL> when a control instance must be passed as an argument. In such cases, the control can be identified either by passing the control handle that is stored automatically in the AutoLISP symbol named in the control's VarName property, or by passing the project name, form name, and control name (or in the case of forms, only the project name and form name) as strings.