I recommend sticking with scales found on either an engineer's scale or an architectural scale. If you cannot use either one to get distances off a plotted drawing what's the point?
Yes the jump from 1:6 to 1:10 means you may not fill a viewport as much as you like, but expecting everyone to double whatever they measure at 1:4 to get every value plotted at 1:8 will lead to computation errors.
You mean something like this?
(defun c:test (/ tst)
;(setq tst (findfile "C:\\data\\test.jpeg")) ;;; --> You can use this for opening a file you already have on your computer
(setq tst (strcat "www.youtube.com")) ;;; --> Or to open a website
(startapp
"C:\\Program files\\Internet Explorer\\iexplore.exe"
tst)
) ;end defun
But I personally like Tharwat's method - short and sweat
(setvar 'cecolor "1") If you got to "Express" Click tools then System variable editor, it gives details about Autocad system variables its a big list so experience comes in. See image, note its a string not a number "171" ps 1 is red