To check the status of certain system variables, you can use the SETVAR command. After issuing the command, enter ? to begin the list, then apply an optional filter. For example entering DIM* will show all the dimension variables.
This is not CAD specific but is still worth mentioning. Sometimes when you try to refer to a long link URL in an email or news post, the link can become broken because the mail/news tool wraps the link into two (or more) lines. Unknowing users are frustrated because the link doesn’t appear to work when they click it, and even experienced users have to paste it into a notepad and remove the line breaks.
In this situation, head to http://www.tinyurl.com and paste in your long link. A tinyurl ‘mapped’ link will be returned thats usually 20-30 characters and will never break.