For some tunable parameters, an additional flexibility is offered: the ability to assign values to these parameters at various stages of system production and execution. These types of parameters are called dynamic parameters. These dynamic parameters define the system environment.
Dynamic parameters form a system-wide environment. A basic set of services allows this environment to be constructed and consulted within a system image, at boot time and runtime.
Compared to static parameters, dynamic parameters require additional target data memory in order to store their names and values.
The procedure for modifying dynamic parameters is detailed in "Modifying the System Environment".