All nodes in a model are composed of slots. It is the job of the top level node to manage those slots and insure that they interact as needed to perform the node's part in the simulation. The values of the data managed by the slot may be changed as needed. Once they are changed, the new data values are effective immediatley. It is not the case that you must save a data file and then restart (although it is strongly recommended that you save your model to a file after making changes and before attempting to run).

Clicking the right mouse button within the box will pop up a menu which allows access to dialogs that can be used to set parameter values. This graphic explains the various parts of the slot display:

• Title: The name assigned to the slot. This name will be used on reports and to reference state variables for calculators. For table nodes, this name is assigned by the modeler and may be changed as desired.

• Type: The slot's type is assigned at creation and may not be changed.

• Units: This gives the units of measure for the slot. This is for display and reporting purposes. The units of measure may be changed by clicking the right mouse button on the slot display and choosing Units from the resulting menu.

• Scale: This is a scale multiplier for the value of the slot. Used for display and reporting purposes. May be changed as with units.

• User Defined Series: This check box indicates whether the slot uses an input time series. (The series may be loaded regardless of whether it is actually used in the simulation.) For an Inflow slot, such a series would represent virgin flow. For an Outflow shot, it would represent demand. This series may be viewed or changed via the menu popped up using the right mouse button. See policy.

• Output Series: This check box indicates whether the slot is to accumulate a time series of the values it assumes during the course of the simulation. The series may be viewed either via a report or via the menu popped up using the right mouse button.

• Constraints: If this icon is turned red, it indicates that the slot has constraints. Constraints may be set or changed via the menu popped up using the right mouse button.

• Rules: When this icon is turned red, it indicates that the slot has one or more rule calculators attached. Calculators may be set or changed via the menu popped up using the right mouse button.

• Facets: When this icon is turned red, it indicates that the slot has one or more facets attached. Facets may be added, deleted or have their parameters set via the menu popped up using the right mouse button.