Free

Frees resources which are currently “owned” by the current entity. These resources must have been captured through a Get statement.

Resource The name of the resource to free. The ALL keyword may be used here to free all resources owned by an entity. Any resource which is not owned by the entity will be ignored.
(Quantity) The number of the resource to free. A value of zero is ignored and values less than zero result in an error. This quantity may be any numeric expression and is evaluated and truncated to an integer every time the FREE statement is encountered.