System

The VarType routine returns a TVarType value that describes the current data type used to hold the contents of a Variant data type. The data type is a 16 bit value, split into a high order 4 bits and a low order 12 bits. The low order bits determine the basic data type, such as varDouble, varSmallInt.  

The high order bits represent meta data types varArray and varByRef.  

In essence, a varByRef variant is a pointer. The data type of the variable it points to is determined in the low order bits.  

Logically And varByRef with a Variant to determine if a Variant is a pointer. 

TVarType 

VarType