A plurality of wireless interface devices, interfaced to a server that may be connected in either a wireless or wired LAN. Each wireless interface device may be a pen-based device which communicates with the server over a radio link. An alternative input system is provided on the wireless interface device in the form of a virtual on-screen keyboard (OSK). Once radio communication is established between the wireless interface device and the server and the OSK is launched, the system prevents overriding of the OSK on the display of the wireless interface device.