What is E then R keyboard shortcut for?

Popular programs using this shortcut

What this shortcut does in different programs?

1. AutoCAD - EXTERNALREFERENCES / Opens the External References palette  
2. Autodesk Revit - EDITING REQUESTS / Displays a list of users' requests to borrow elements in worksets, as well as pending requests.  
3. LibreCAD - Modify delete  
4. QCad 3.22.0 - Delete  
5. AutoCAD LT (2024) - EXTERNALREFERENCES / Opens the External References palette.  

All programs

All programs using this shortcut, by category.