On a Windows NT system, you can use the print pooling option to pool a network printer with an unused LPT port. When you send a print request to that LPT port, the document will be redirected to the network printer.
Click the Start button, point to Settings, and then click Printers.
Right-click a printer icon and then click Properties.
The printer Properties page opens.
Click Ports.
Select Enable Printer Pooling.
Select a port-- LPT1, LPT2, or LPT3--that does not have a local printer attached to it.
You should now be able to print to the LPT port from a 16-bit DOS application.