In my group, we are little confused about this:
-The Gift "EXP BONUS"...
Give to the PC an XP bonus equal to the half of the total XP given to each player of the party (i,e, 4 XP, halved for +2 XP bonus).
or...
Give to the PC an XP bonus equeal the half of total XP given to all party players (i.e, if they are 4 players with 4 XP each, total is 16 XP, halved for +8 XP bonus).