====Option screen====

{{ :option_screen.png?direct&200|}} The option screen lists all [[general variable|options]] offered by the [[sub-system|sub-systems]] that you have selected for you [[model]]. 

====Tool bar====

| {{ help24.png }}| Help | Shows this page |

====Changing options====

Select an option in the list to the left to change it. Information about the selected option appear in the panel on the right. 

Under the description is a section named **Target**, in which you can select from different choices. A choice is selected by using the check box next to it.

{{ ::option-default.png?nolink|}} **Note** - Some options allow you to make different choices for different [[contaminant|contaminants]]. For example, the [[:merlin-expo:models:Man]] model let you specify if a specific contaminant enters the body via the GI tract or via the liver. For these options there is a drop-down menu just below the **Target** label where you select for which contaminant you want the choice. Use the [[default]] item in the list if you want to apply the same choice to all contaminants. 

====See also====

  * [[Options]]
  * [[User interface]]