Would be grat to have access to more than just one schematic representation of an element in my project.
For example on one schematic drawing I have an element. On the next schematic drawing I would like to place the same element(onother instance of the first) but in much more detail.
Bottom line:
Iit can be a Push Button, Relay, Terminal point, etc. Most important thing is that the TAG updates to the same value on both drawings after using project wide updates.