If you cannot get a local network printer to print while connected to RDP (Terminal Services) session, do the following:
1. Share your local network printer. Example share name HP6600.
2. Add a dummy local printer on port LPT2: with the same drivers for the network printer. Example HP Officejet 6600.
3. Then open a command prompt and run this script "net use LPT2 \\localhost\HP6600 /persistent:yes"
PROBLEM SOLVED!