To add a variable, click on the Add Variable button located in any of the three configure environment fields (Machine, Activity, and Global). Next, enter the variable name into the Variable input line and then enter the desired value into the Value input line. You can also choose one of the pre-defined values by clicking on the Macros button and then selecting one of the variables from the pop-up menu. After clicking OK, the configure environment field will display the new variable as Set. If you delete the value of this variable using the Edit button, the variable will display as Unset.
To develop scripts that may affect numerous environment variables or other configuration settings, enter the name of the script into the New Script pop-up window in the Script input line. The script will display in the configure environment field as Run.