Nothing

concerns

The Nothing keyword is used to dereference a COM object reference. The assignment is like a value assignment:

COMObject := Nothing

Note: Multiple object variables can refer to the same object. When an object variable is assigned a value of Nothing,  that variable then no longer references a current object. If multiple object variables reference the same object, the memory and system resources reserved for the object to which the variables reference are not released until all object variables are set to Nothing.