Players Cause
Use the pc: parameter to list one or more players that caused an action. This is simply an alias for p:[playername].
pc:[playername]
Supports multiple (comma separated)!
Searches for activities caused by a player.
pc:viveleroi will query activities in which viveleroi was the cause.
Negation
As of Prism 4.4, this parameter allows negation. Negating an action will exclude results. It is important to note that unlike Prism 3, the syntax has the exclamation point before the colon. You cannot use a negated parameter with its normal equivalent.
Example: /pr l pc!:viveleroi (Queries all players except "viveleroi")