Does ArcIMS support UNC pathnames as an alternative to using mapped drives?
Yes. You can use Universal Naming Convention (UNC) pathnames instead of mapped drives when you have ArcIMS components on more than one computer. The drawback to mapped drives is that they are inaccessible if no users are logged in to the computer with the mapped drives. UNC pathnames will continue to work in this situation. This is particularly important if the Output directory for images from the Spatial Server resides on a different computer than the web server. A sample UNC pathname is \\myserver\output.