Viivi Output-Port Window

[NOTE]
The correct terminating condition in the algorithm for the factorial calculation should be (= n 0).
To say the truth, Viivi currently has a Problem.
I wrote a sample code in order to explain and ask the problem, including a modified condition (= n 1), and made a mistake to use the code directly for creating the figure.
The condition in the figure will be corrected in the next update.
I apologize for any inconvenience this may cause to you.

The Viivi input-port windows have dark-green backgrounds by default.

Every output-port has its own output-port window, and the window shows the contents output to the output-port.

If you want to separate the contents output only to the standard-error-output port, say, to a virtual-output-port named [err.out], please provide an argument-command "-e [err.out]" beforehands.

The user cannot edit the contents displayed on the output-port windows.