<btID>— is the ID of the build configuration to get the property from. Only the configurations the current one has snapshot or artifact dependencies on are supported. Indirect dependencies configurations are also available (e.g. A depends on B and B depends on C - A will have C's properties available).
<property name>— the name of the of the build configuration with the given ID.
When using build parameters of type "Password", referencing them from a dependency such as
Overriding Dependencies Properties