The disadvantage is that the server is not concurrent (multiuser).
A typical distributed application is a multiuser game or learning environment where users on multiple machines interact with each other in a common virtual world.
Some electric pumps allow for multiuser operation, requiring only an accessory kit for each user.
Windows also has full support for multiple input/mouse configurations for multiuser environments.
For this reason, it does not support a notion of users (it's not a multiuser system) or processes - everything runs in the kernel address space.
Resource contention can become an issue with the standalone multiuser model as concurrency requirements and network operations increase.
It was a relational query system with powerful query facilities, but very limited update facility and no simultaneous multiuser facility.
The multiuser support is a shared-file mode implementation where the operating system provides the locking rather than the server process.
