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Variable names uniquely identify variables. Multiple icons on the canvas may have the same name -- they all refer to the same variable. Variable names have scope, which is either local (no initial `:'), belonging to an outer group (indicated by a leading `:' on the inner group variable, and the outer group variable having no such leading `:'), or completely global otherwise. You may select a variable name from a drop down list in the “name” combo box, which makes for an easier way of selecting exactly which variable you want.