Do SomeProcedure with lcSomeCharString1, lcSomeCharString, llSomeBoolValue

With the above syntax your parameters are passed by reference by default and to pass them by value you must surround them with ()'s

SomeProcedure(lcSomeCharString1, lcSomeCharString, llSomeBoolValue)

With this syntax your paratemeters are passed by value by default adn to pass by references you must preceed each one with the @ symbol.