While attendees are usually within the same ballpark when it comes to the content being delivered, some are often left off the playing field because of the divergence in computer use skills (mouse/windows/OSS). Be clear about assumptions/expectations for each class.
To protect the hard drive and loaded programs some level of accessibility has been denied to general users. This sometimes requires circumnavigating the system to perform perfunctory tasks; for example adding clip art in PowerPoint - we can’t just double-click to add clip art, rather we have to use the up one level icon and sort through the file structure to Insert a Picture. This makes it difficult when you have to notify students that “on your own office/home computer you don’t have to do it this way”
Saying no to using classroom for a non-intended use, not allowing those who are not eligible to attend our “free” classes - such as faculty spouses, not exceeding class size limits, etc.
Because a faculty member or department head, etc. wants to use the classroom and didn’t have the foresight to reserve or request services doesn’t mean we have to go beyond the call of what is humanly possible. Try to accommodate but not at the expense of quality of service.