setting hat on a character in GS2

[Cherrykao]

i know the GS1 command is "setcharprop #P1" for setting a hat on an NPC, but is there a GS2 command for setting a hat on a character or NPC like "headimg" for head, "bodyimg" for body, etc...

i also have another question. how or what function determines whether or not players are able to walk through another player and players cannot walk through other players? do people just script their own functions for this or is there a command that can be used?? thanks.