A first personal portable device to interact with a wireless network having a topology having a first point-to-point link to directly connect the first personal portable device to a second personal portable device in use, the first personal portable device comprising: a processor; a wireless transceiver operable by the processor to enable communications across the wireless network with the second personal portable device; a storage accessible to the processor in which is stored a routine comprising a sequence of instructions, that when executed by the processor, causes the processor to: store within the first personal portable device an indication of an extent of interaction of the first personal portable device with the wireless network measured over a time period; receive through the wireless transceiver an indication of an extent of interaction of the second personal portable device with the wireless network measured over a time period; compare the extent of interaction of the first personal portable device with the extent of interaction of the second personal portable device on a recurring basis; and cooperate with a processor of the second personal portable device within the wireless network to move the first personal portable device from occupying one position within the topology of the wireless network to occupying a different position within the topology of the network in response to a result of a comparison between the extent of interaction of the first personal portable device and the extent of interaction of the second personal portable device; characterised in that the extent of interaction of the first personal portable device with the wireless network is measured either: as a percentage of a time period during which the first personal portable device is within the wireless network such that the first personal portable device is accessible to the second personal portable device through the wireless network; or as a percentage of a time period during which the first personal portable device exchanges data with at least one other personal portable device within the wireless network. a processor; a wireless transceiver operable by the processor to enable communications across the wireless network with the second personal portable device; a storage accessible to the processor in which is stored a routine comprising a sequence of instructions, that when executed by the processor, causes the processor to: store within the first personal portable device an indication of an extent of interaction of the first personal portable device with the wireless network measured over a time period; receive through the wireless transceiver an indication of an extent of interaction of the second personal portable device with the wireless network measured over a time period; compare the extent of interaction of the first personal portable device with the extent of interaction of the second personal portable device on a recurring basis; and cooperate with a processor of the second personal portable device within the wireless network to move the first personal portable device from occupying one position within the topology of the wireless network to occupying a different position within the topology of the network in response to a result of a comparison between the extent of interaction of the first personal portable device and the extent of interaction of the second personal portable device; characterised in that the extent of interaction of the first personal portable device with the wireless network is measured either: as a percentage of a time period during which the first personal portable device is within the wireless network such that the first personal portable device is accessible to the second personal portable device through the wireless network; or as a percentage of a time period during which the first personal portable device exchanges data with at least one other personal portable device within the wireless network. store within the first personal portable device an indication of an extent of interaction of the first personal portable device with the wireless network measured over a time period; receive through the wireless transceiver an indication of an extent of interaction of the second personal portable device with the wireless network measured over a time period; compare the extent of interaction of the first personal portable device with the extent of interaction of the second personal portable device on a recurring basis; and cooperate with a processor of the second personal portable device within the wireless network to move the first personal portable device from occupying one position within the topology of the wireless network to occupying a different position within the topology of the network in response to a result of a comparison between the extent of interaction of the first personal portable device and the extent of interaction of the second personal portable device; characterised in that the extent of interaction of the first personal portable device with the wireless network is measured either: as a percentage of a time period during which the first personal portable device is within the wireless network such that the first personal portable device is accessible to the second personal portable device through the wireless network; or as a percentage of a time period during which the first personal portable device exchanges data with at least one other personal portable device within the wireless network.