A feedstock composition and a method of forming metal articles using powder metallurgy techniques comprise mixing metal powders and a novel aromatic binder system. The monitor enables selective lowering of the frequency of clock signals, or stopping and starting of clock signals, being received by said processing unit in response to a changing level of activity associated with said processing unit. On-line presence information is provided to indicate the on-line presence of users with whom a digital item has been shared, may be shared or is being shared.