A few years ago computers for innkeeping meant a web site, email, a bit of web browsing, and a Word Processing program. If you were adventurous, perhaps you would add online availability/booking and a rudimentary reservation management system on your desktop. But those were simpler days.
Today there are literally dozens of different guest management platforms available, some web-based, some install on your computer. Web sites are no longer optional, but are the primary marketing medium for most inns.