A method of controlling wireless communication between a master computing device and a plurality of further computing devices (102, 103), the method comprising: i) generating a discovery request at the master computing device, the discovery request targeted to the plurality of further computing devices (102, 103) and configured to generate a list of discovered further computing devices (102, 103) for communication with the master computing device; and ii) identifying at the master computing device, via a user interface, at least one selected further computing device (102, 103) from the discovered further computing devices (102, 103) being permitted to access the master computing device, the at least one selected further computing device (102, 103) being defined with at least one device identifier to identify each of the at least one selected further computing device (102, 103) in an access list, wherein the access list is configured and stored on the master computing device for controlling said communication between the master computing device and the plurality of further computing devices (102, 103); characterized in that iii) via a user interface at the master computing device, an operator or administrator may interact to initiate a restricted mode of operation on the master computing device, the restricted mode of operation being configured to: (a) permit communication between the master computing device and at least one further computing device (102, 103) on the list of discovered further computing devices (102, 103) in response to determining that the device identifier of the at least one further computing device (102, 103) is on the access list; and (b) prevent further communication between the master computing device and each further computing device (102, 103) on the list of discovered further computing devices (102, 103) in response to determining that the device identifier of each of the further computing devices (102, 103) on the list of discovered further computing devices (102, 103) is not on the access list, including terminating an existing connection between the master computing device and each of the further computing devices (102, 103) upon determining that the device identifier of said each further computing device (102, 103) is not on the access list. i) generating a discovery request at the master computing device, the discovery request targeted to the plurality of further computing devices (102, 103) and configured to generate a list of discovered further computing devices (102, 103) for communication with the master computing device; and ii) identifying at the master computing device, via a user interface, at least one selected further computing device (102, 103) from the discovered further computing devices (102, 103) being permitted to access the master computing device, the at least one selected further computing device (102, 103) being defined with at least one device identifier to identify each of the at least one selected further computing device (102, 103) in an access list, wherein the access list is configured and stored on the master computing device for controlling said communication between the master computing device and the plurality of further computing devices (102, 103); iii) via a user interface at the master computing device, an operator or administrator may interact to initiate a restricted mode of operation on the master computing device, the restricted mode of operation being configured to: (a) permit communication between the master computing device and at least one further computing device (102, 103) on the list of discovered further computing devices (102, 103) in response to determining that the device identifier of the at least one further computing device (102, 103) is on the access list; and (b) prevent further communication between the master computing device and each further computing device (102, 103) on the list of discovered further computing devices (102, 103) in response to determining that the device identifier of each of the further computing devices (102, 103) on the list of discovered further computing devices (102, 103) is not on the access list, including terminating an existing connection between the master computing device and each of the further computing devices (102, 103) upon determining that the device identifier of said each further computing device (102, 103) is not on the access list. (a) permit communication between the master computing device and at least one further computing device (102, 103) on the list of discovered further computing devices (102, 103) in response to determining that the device identifier of the at least one further computing device (102, 103) is on the access list; and (b) prevent further communication between the master computing device and each further computing device (102, 103) on the list of discovered further computing devices (102, 103) in response to determining that the device identifier of each of the further computing devices (102, 103) on the list of discovered further computing devices (102, 103) is not on the access list, including terminating an existing connection between the master computing device and each of the further computing devices (102, 103) upon determining that the device identifier of said each further computing device (102, 103) is not on the access list.