It is possible to create functions within a script, using DialogScript code.

A function definition starts with a label, which has the same name as the function name. The function ends when an exit command is reached. 

A function is used in the same way as a built-in function, using its name prefixed by "@" and followed by a pair of brackets, which may enclose up to 9 arguments. 

The values of these arguments can be accessed within the function code itself using %1, %2 .. %9. 

To return a value as the result of a user-defined function, one string may be given as the parameter to the function's EXIT command. 

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