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It depends. If you're only working inside one drawing file, and you're creating all the content inside the drawing, then there's probably no need for xrefs. But if you're creating multiple drawings that all need to share the same base information, then xrefs are kind of important. Also, if you're receiving files from outside sources, like an architect, then you should xref the architects files into your drawing.

It is interesting, and its all I can give. You are welcome.

Best to use Annotative Text and Dimension NghiaKieu. Easier for everyone. Understanding annotation scale of AutoCAD

You're on Layout Tab [ Paperspace ] and you want to select objects on a seleted viewport? And do what with the selection? Or is that "activate by lisp" means iterate through all VP and do something? What is the something then?

An xref is just another drawing that is referenced into your current drawing. Xref's are useful when you have a base file, like a floorplan, that you need referenced into multiple other drawings. By having the floorplan as an xref, you can make changes to that drawing and those changes will show up in all the other drawings that have the floorplan xref inserted, once you reload it. Here's a video explaining how xrefs work.

Thanks @Steven P @Tbag Assuming that you are referring to an image inserted in the active drawing, the resolution can be obtained from DXF group 13.

@Dadgad, I figured you were being smart since I knew you are senior to me. Being referenced as a young gun definitely cracks me up. I thank you for the kind words. You were always the voice of reason and always treat the posters with professionalism and I learned from the best. I feel like I had an interesting career and tried to always learn and strive to do better. When I went from the board to AutoCAD I knew very little about the program, just what I could learn in a 2 month class at the community college. I was very worried about measuring up and consequently spent way too many hours away from work doing nothing much else but teaching myself more about AutoCAD. I remember when we did a presentation on AutoCAD in ~1991 using slides and creating a slide show. Everyone’s mind were blown and we were rock stars for a day or two. A few of us figured out how to create a virtual drive in the memory on our computers (~1990) and copy the AutoCAD.exe file there and then start the program. This was all done with a DOS file, I think it was called a batch file but my memory is not that great anymore. It was noticeably faster to do it that way and was possible back when the program was so small. Even though I learned on R9 the first company I worked for had bootleg copies of R8 (v2.6) and we used that for about a year. After that they bought R9 licenses and I was still able to copy the program and put it on my home computer, in fact my boss encouraged it. I have used Action Recorder a time or two but never really got into the habit of remembering it was there. It got better over the years and the few times I thought to use it I did like the result. In the bad old days of the early 90’s CADalyst magazine would publish a lisp file each month. I would copy those by typing what was printed and of course I would make at least two typos and the thing wouldn’t work. So off I went trouble shooting the lisp file and finally finding my mistakes. I did learn quite a bit about rudimentary lisp writing but I have forgotten most of that. These days if I need something I just look on Lee-Mac’s web site and can often find an awesome program that is light years ahead of what I could do. I have donated to his site a few times but certainly not near enough. The post of the ‘clipped’ viewports was not something I can claim credit for. I learned about that somewhere else and simplified what they had done and added step by step instructions. I will post the drawing since I do still have it. Digging up old posts of mine on the Ribbon: man I hated that when it first came out. I am often too quick to judge a new feature like that but with time and learning to customize it I definitely became a fan. I agree, there used to me more general questions from new users but I assume the number of new users of AutoCAD is going way down with the advent of BIM and 3D programs like Inventor. I can see myself still looking in and posting if I have something to offer. As you said, more questions on programming and fewer on actually using the program. Thanks again. viewport in viewport 2007.dwg

Why do you say that? I don't recommend doing this, but if you want the Xref to be unselectable, put it on the Defpoints Layer and then Freeze Layer 0.

The explorer is extremely useful for ifc editing imports and getting workable dwg files. A small demo https://youtu.be/e4RFG80Imoo