I'm a little confused about the instructions I received when my request was refused because of my "no cats in the home" condition.  (Now all you cat lovers be kind; I love cats,  I'm just very allergic.)  The email said  since this was the only copy in the system  that the title would be put on my Reminder list and when that copy is gone I can put it on my Wish List.   How do I know when the book is gone?    Check my reminder list from time to time to see if the "1" has gone to "0"?    Am I missing some more automated way?   Thanks for your input.

Nope you are right......you are responsible for putting the book back on your WL once that lone copy gets sent to someone else.  And the only way I know of is to periodically check it under "search" or your reminder list.  I have had this happen to me because of my "no smoking" RC.