This VR&PDA research project focuses on the design and implementation of interfaces for interaction with Immersive Virtual Environments through handheld devices. The use of this kind of devices, combined with wireless networking, improves the usability of standard VR. This could be particularly useful in application fields (i.e. Virtual Heritage), where, for the vast majority of users, we cannot expect any significant exposure to advanced VR environments and their specialized interfaces. The current implementation includes a Graphical User Interface and support for multi-presence based on peer to peer communication.