Flow variables

Flow variables provide a means of passing information throughout a flow instance without requiring that the information to be passed through data links. Flow variables are name-value pairs that persist, unless deleted, until the flow instance completes its execution.

Flow variable names cannot start and end with an underscore (_). A variable that starts and ends with an underscore is considered a reserved, internal special variable. It cannot be set or manipulated, from a user defined node of a flow. Flow variable names are case-sensitive, and associate a value in text format.

Flow variables fall either under custom or special categories.