The invocation counter records the number of times each contract was invoked in current InvocationTransaction.

Consider that we have an InvocationTransaction with the following Script:

APPCALL <A>
APPCALL <B>
APPCALL <B>
APPCALL <C>

If we call System.Runtime.GetInvocationCounter in each contract, we will get:

• 1 from APPCALL <A>
• 1 from the first APPCALL <B>
• 2 from the second APPCALL <B>
• 1 from APPCALL <C>