Here's a hint for how the ICHG website works. For big companies, you can book by going to
http://www.ichotelsgroup.com/companyname (replace companyname with the name of the company you're working for - of course you are working for them, right?
). You'll find there's a wide range of companies available, but expect to be asked for ID on check-in (again, no problem if you're working for them I'm sure
).