COUNTER Usages

How do I run a COUNTER 5 report?
What are the main differences between COUNTER 4 and COUNTER 5?
What is COUNTER?
Is Sage Journals COUNTER compliant?
What are the standard reports under COUNTER 5?
What is the COUNTER Release 5 Code of Practice? Why was it necessary?
How are user sessions counted under COUNTER Release 5 that may result in differences when comparing to COUNTER 4 usage reports?
Are COUNTER Release 4 usage reports still available?
How will I know which report to run?
I see that Consortia Reporting is not currently available under Release 5, what should I do?