property Parameter.Value as Variant
Indicates the parameter's value( or values if a safe array is used ).

TypeDescription
Variant A VARIANT expression that specifies the value of the current parameter, or a safe array of VARIANT if it contains multiple values.
The Value property specifies the value/values of the parameter. The Name property specifies the name of the Parameter. The UserData property holds any extra data associated with the parameter object. 

The following is an example of a parameter:

RDATE;VALUE=DATE:19970304,19970504,19970704,19970904

The DATE specifies the value of the parameter.