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.
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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