An effort was made to shore up the Open Door in 1921-22 at the Washington Naval Conference, but a challenge was again mounted by the Japanese in the 1930s as they expanded their control in Manchuria. China would not be recognized as a sovereign state until after World War II.
The maximum number of connections across SQL Server versions and editions is 32,767. You can determine how many connections SQL Server currently has by looking at:
Originally SQL Server had its own simple login and password system, which was completely independent of Windows security, and was logically consistent. All groupings of users was done at database level, and there was just one privileged login to administer the system.