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Problem with Printing

If you have a physical printer connected to an LPT port of your computer but you can not print from primary operating system and/or several virtual machines despite the printer being properly connected and configured, this may be caused by the following reason: the running virtual machine's parallel port is connected to a real LPT port which is blocking this LPT port. If printer cable is attached to that port of a physical computer, no other virtual machine as well as primary operating system can access printer.

To solve the problem:

Documents that have been sent for printing in primary OS or other virtual machines while you were unable to print are accumulated in the spooler and will be printed according to the sequence they arrived. If you run several virtual machines with their parallel ports connected to printer through the same physical LPT port, you may be required to consequently disconnect their parallel ports to print all the documents.