On the Lotusphere 2008 I saw a great tip. It showed how to customise some of the more unhelpful errors on the Lotus Notes clients and make them useful, by replacing the error text that pops up on the client, with something you put in instead.  Very very nice.....

Now you can change the:

 "An error was encountered while opening a window."

 via (notes.ini): Err_2EBB=An error was encountered while opening a window. Please reboot your system.

 to: An error was encountered while opening a window. Please reboot your system.

 More infos can be found here .