I think everyone should know that you can install two or more versions of Notes Client on the same machine by installing onto a different directory and have a different Notes.ini for each installation.
But do you know that you can even launch these clients concurrently? The advantage of this is to allow you to access to different Notes domains (not cross-certified) without switching location and id file.
The trick is instead of calling Notes using Notes.exe, use nlnotes.exe
1st shortcut: D:\notesr457\nlnotes.exe =D:\notesr457\notes.ini
2nd shortcut: D:\notesr5\nlnotes.exe =D:\notesr5\notes.ini
3rd shortcut: D:\notesr463\nlnotes.exe =D:\notesr463\notes.ini