A system for regulating access to a resource by a plurality of users, the system comprising: a plurality of portable access keys, each portable access key being provided to one of the plurality of users and having a variable access parameter associated therewith, each portable access key further allowing the respective user to indicate a desire for a number of people to access the resource and being arranged to store this indication; a queue manager, arranged to set an access criterion for the resource; a queue interface, adapted to determine that the variable access parameter for a portable access key for which the desire for the number of people to access the resource has been indicated meets the access criterion, and consequently to register the portable access key and the desired number of people in a queue sequence; wherein the queue manager is further arranged to receive the registration of the portable access key and the desired number of people in the queue sequence, to manage the queue sequence and to communicate to a portable access key that has been added to the queue sequence an indication of when it can access the resource, wherein the portable access key comprises a transceiver configured to receive the indication of when it can access the resource, wherein the variable access parameter associated with the portable access key is reduced after the queue manager communicates an indication of when the portable access key can access the resource; and wherein the queue manager is further configured to set the access criterion for the resource on the basis of a length of the queue sequence, wherein the length of the queue sequence is determined by a number of portable access keys registered in the queue sequence and the desired number of people associated with each portable access key, wherein the queue interface forms part of the portable access key or wherein the transceiver of the portable access key is configured to communicate the indication of the desire for the number of people to access the resource to the queue interface, wherein the variable access parameter comprises a number and wherein, for each of the plurality of portable access keys, the system is arranged to measure the time elapsed since the respective variable access parameter was reduced and to increase the respective variable access parameter based on the measured time elapsed. a plurality of portable access keys, each portable access key being provided to one of the plurality of users and having a variable access parameter associated therewith, each portable access key further allowing the respective user to indicate a desire for a number of people to access the resource and being arranged to store this indication; a queue manager, arranged to set an access criterion for the resource; a queue interface, adapted to determine that the variable access parameter for a portable access key for which the desire for the number of people to access the resource has been indicated meets the access criterion, and consequently to register the portable access key and the desired number of people in a queue sequence; wherein the queue manager is further arranged to receive the registration of the portable access key and the desired number of people in the queue sequence, to manage the queue sequence and to communicate to a portable access key that has been added to the queue sequence an indication of when it can access the resource, wherein the portable access key comprises a transceiver configured to receive the indication of when it can access the resource, wherein the variable access parameter associated with the portable access key is reduced after the queue manager communicates an indication of when the portable access key can access the resource; and wherein the queue manager is further configured to set the access criterion for the resource on the basis of a length of the queue sequence, wherein the length of the queue sequence is determined by a number of portable access keys registered in the queue sequence and the desired number of people associated with each portable access key, wherein the queue interface forms part of the portable access key or wherein the transceiver of the portable access key is configured to communicate the indication of the desire for the number of people to access the resource to the queue interface, wherein the variable access parameter comprises a number and wherein, for each of the plurality of portable access keys, the system is arranged to measure the time elapsed since the respective variable access parameter was reduced and to increase the respective variable access parameter based on the measured time elapsed.