CASCADING
When cascading keys (those starting with /) the lookup will work in the following way (it can be debugged with kdb get -v):
1.) In the spec-key the override/# keys will be considered. 2.) If, in the spec-key, a namespace/# exist, those namespaces will be used. 3.) Otherwise, all namespaces will be considered, see here. 4.) In the spec-key the fallback/# keys will be considered. 5.) In the spec-key the default value will be returned.
See application integration for how to use cascading names in the context of applications.
Read more about namespaces.