I was contemplating buying a Brother HL3140CW http://www.costpercopy.ie/Brother_HL.../hl-3140cw.htm I require a semi portable printer, for location work, with wireless access. However, I need to restrict access to the printer to a handful of users as there might be 50+ people on the wireless network. Is there such a printer which requires perhaps a pin/code to enable printing? Unfortunately the Brother HL3140CW doesn't allow pin/code restriction. Thanks.