There are no accessibility problems if you are simply scheduling a meeting with another user via Google Calendar.
Google Calendar can be accessed through either a Web browser or through a third-party calendar client. That said, the most promising strategies for accessible use of Calendar involve free synchronization tools: CalDAV with iCal (Macintosh) and Google Apps Sync with Outlook (Windows).
provides instructions for how to synchronize your Google Calendar with different devices and applications. Not all functions available in the Web Browser version of Google Calendar, like browsing other people's schedules and finding common meeting times, will be available in third-party clients. If you need to set up a client to access VT Google Apps Calendar, see Configuring a Client to Access VT Google Apps Mail.