Question
Is there anyway to book a room for a meeting and have it represented in the Calendar? And if there is a meeting in one of the board rooms during a requested time will the bpm'online notify the requester that the time slots requested are unavailable?
Answer
There is no such functionality built, but it can be easily implemented by adding new object (or renaming existing one) and building at least one business-process.
Basically, you need to add an object for rooms and store the data there (name, location etc.). Then you need to add lookup field to Activity section selecting this object. Hence, you will e able to select the room in the activity record.
As for already booked room, you can try to create a business-process starting on creating or modifying the activity and checking whether any activity already has this room booked for the time you have selected and create a notification/send an email etc.
Also, there is an option to create a pop-up, but it requires high development knowledge.