[shoo]

maybe there is an email thread shared between all clients for acquiring / releasing the write lock on the xml file

[K-Wall]

Semaphore as a service Slack Chat bot.

[noir_lord]

Seen that.

Shared drive with excel files, people would shout at each other to 'release the lock'

[zimpenfish]

Yeah, first real job had the customer database as a VB frontend onto an Access file shared over {whatever Win95 was using in 1996-97}. After a few snafus, the CS / Sales people learned that they had to single-task with the database.