The pictoral scheduler is just a program created to solve a common task at work: Drawing up graphical student timetables. These are used for students who have difficulty following a conventional written timetable. I saw a teacher producing one of these in Microsoft Word, but this program is not intended for such a purpose and using it in that way was clearly cumbersome.
Usage is very simple: Select a lesson and room, or a teacher, and click in whichever square you want to place it in. The student name can be edited too. The timetable can be 'saved' to a quite densely-encoded string of text suitable for emailing or pasting into a document, and this text loaded again by just pasting into the appropriate location.