Username and password have to be sent via auth fields.
company= is an accepted argument.
Start with a blank browser or browser tab.
write/paste url (This can be bookmarked in your browser)
Get the login page
The Company field are filled inn from the company=database_name argument in the url.
Compiled from this e-mail treads:
Question from: Håvard Sørli
Answer and software fix from Chris Travers