Properties of objects such as: Layer names, Block names, Color, Linetype, Line-width can be sourced from existing objects by clicking on a relevant object.
MycadHELPER commands such as QL Query Layer can reveal a Layer name by clicking on an object. Left and right clicks provide different levels of information. For example when Querying a Block a left click produces the Block’s insertion layer wheras a right click returns the layer of the object within the Block.
Doesn’t sound like much but saves an enormous amount of time when responding to commands or researching the data.