Global variables
Function arguments can be global variables. For example,  _TASKUSER  represents the current user.
Syntax
Context.variable
          | Copy Methods Global Variable | Data Type | Refers to | 
|---|---|---|
 _MODELOBJECTKEY  | 
             String | The object code of the object being copied. This includes the version of the object. | 
 _MODELOBJECTSYMBOL  | 
             String | The symbol, or type of object, of the object being copied. | 
 _OBJECTKEY  | 
             String | The new object code, including the version. | 
 _OLDCODE  | 
             String | The object code of the object being copied. If the object, such as a formula, supports versions, the version is not included. | 
 _OLDVER  | 
             String | The version of the object being copied for objects that support version control, such as a formula. | 
 _REFOBJECTKEY  | 
             String | The object code of the object on whose References tab an object is being created; used in copy methods for creating objects on the References tab of another object | 
 _REFOBJECTSYMBOL  | 
             String | The symbol of the object on whose References tab an object is being created; used in copy methods for creating objects on the References tab of another object. | 
 _TASKUSER  | 
             String | The current user. |