SRWare.net

Rather than start Iron normally then open a separate incognito window, is there a command line switch or some other setting to force Iron to run in incognito mode directly.

There is infact a way:

if you're using an Iron shortcut, add --incognito as a 'commandline option' (on the Target: field)

e.g "C:\Program Files\SRWare Iron\iron.exe" --incognito

If you added it correctly, you'll see the private browsing icon, info screen, and your active tab will be titled Private Tab.