When I invoke Toucan with the commandline and forget the possible options, I use "Toucan.exe -?" to ask what they are.
The good news is that Toucan helpfully lists the correct options for me.
The bad news is that it does this in a popup text window that lasts for about 50 milliseconds before it closes itself, making it impossible to read.
Could you please place a "press any key to continue" prompt at the end of that list? This would prevent the Toucan window from exiting until the user had a chance to read the "help text".
On the same topic, the Toucan "help" page in the "help.html" file in the Toucan install folder has no link to the actual "toucan manual", nor is there any obvious link to the "manual" from the main Toucan website page ( https://portableapps.com/apps/utilities/toucan ) -- there's a "using Toucan" link there that doesn't go to any actual documentation. The only way I've found to reach the documentation is to launch Toucan itself, go to the last tab, and hit "Help" from there. It ought to be a lot easier to find/read the documentation, especially for users who have not yet installed Toucan or who are having trouble launching it.