Windows NT-based operating systems have a TCP printing service (Windows 9x/Me does not). Once installed (Control Panel/Networks/Services/Add), a command line-based lpr.exe is located in %SystemRoot%\system32. Unfortunately this utility does not accept stdin for the printer data, so your application must be modified to output the formatted printer data to a file and then ask lp to send it to a tcp printing service on some server.
MKS Toolkit porting products do provide /dev/lp which interfaces to the default printer. And, you can send data directly to a network printer with open("//<server>/<printer>"). | 
