The best way to look up whether or not a specific classroom is in use is by inserting a date range (not a term code).
Go to SSAMATX
Enter the Building Code
Enter the Room Number or code
Tab until you reach "Term"
If there is a term code in the term field, delete it.
Tab once more to "Start Date"
Enter Start and End dates in the DD-MON-YYYY format
Execute Query (F8)
Determining whether a course is Credit, Non-Credit or an Event
Credit courses will have a term code ending in 01, 02, 04 or 08
Non-Credit courses will have a term code ending in 03, 06 or 09
Events will have a "Function" code
Printing the results:
Click the Help menu item at the top of the screen.
Click "Extract Data No Key"
A Microsoft Outlook Window with the data will open.