The Design Center

The AutoCAD Design Center is a drawing management system with several powerful advantages to the user including: a) 

the ability to browse and access different drawing sources

b) 

access drawing content including Xrefs, blocks, hatches and symbol libraries

c) 

view object definitions (e.g. layers) prior to inserting, attaching or copy and paste into the current drawing

d) 

search for specific drawing content

e) 

redefine a block definition

f) 

create shortcuts to drawings and folders

e) 

drag drawings, blocks and hatches to a tool palette.