Hi,
A lot of devices do allow you to plot into a file (in HPGL format). Save your file as file choosing a standard plotter with same bumber of pens and then in windows send the file into the plotter in RAW format. It always works.
the other way is to ask your system admin to create shared dorectory and a small windows program to do this automatically for you. The program will check out the content of a directory and every time there is a file there, it will dump it to the printer.
BR,
/Farhad