Affected Players
Use the pa: parameter to list one or more players affected by an action.
pa:[playername]
Supports multiple (comma separated)!
Searches for activities that affected a player.
pa:viveleroi will query activities in which viveleroi was affected by an action.
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 pa!:viveleroi (Queries all players except "viveleroi")