EXPRESSTOOLS places the Express directory on the search path, and loads and places the Express menu on the menu bar. You can use this command to make the AutoCAD Express Tools available in the current profile if they are not yet available. The AutoCAD Express Tools can be installed with AutoCAD, or you can add them later using Add or Remove Programs on the Control Panel.
Once the EXPRESSTOOLS command is used, the AutoCAD Express Tools libraries are loaded when AutoCAD is launched. This increases the load time for AutoCAD but reduces the delay when you use one of the tools for the first time.