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The Slots & Properties window present the properties for all framesall frames.
In the window you can change parameter-properties such as the "Determined by" property to specify whether a paramter is always input (VR) or should always be determined by the system (SYS or SYL). Moreover, you can change the relation-property "Use" into one way (OW: Function), specifying the relation can only be used to determine the left side parameter, or two way (TW: Equation), specifying your relation is an equation and can be used to determine all including parameters.
When a selected parameter is instantiated in a Taxonomy entitya Taxonomy entity, the background will change into the color that is specified in the Tools>Optionsthe Tools>Options... Colors tab.