The title says it all. [tag:p4] has been used to either tag a question regarding the [tag:perforce] revision control system or, in [one case][1], to indicate a hardware platform. As [tag:p4] was less widely used, apparently ambiguous and referring to the command line client utility of the perforce suite only, I have removed / replaced this tag from questions using it, so it should be merged into [tag:perforce]


  [1]: https://serverfault.com/questions/110279/is-disk-dying-weird-numbers-on-iostat