Runtime-Dependent Area Properties 
The same points apply to runtime-dependent properties of an area as to dynamic area properties, with the difference that they can only be given default values by a developer and can also be changed without a developer key, for example, by administrators, during Customizing, or during operation.
With client-dependent areas, the runtime-dependent area properties can be set individually for each client. The default values are used if no separate runtime-dependent area properties are specified for a client.
Size of an Area Instance Version