a poor man's hack around this might be to install calibre on each client and ensure library location is consistance, ie c:\mylibrary then creat a script would test for a network temp.lck file and if not found create it, copy the network copy of your calibre library to local location then run calibre. have script delete the temp.lck file after calibre is shut down. I do not have home network to test this on but have used similiar scripts in linux to automate backups of my libraries.
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