for script, you can found manuel here : http://www.towalker.com/english/WalkerScriptEn.zip
i seen this too, on towalker.com :
Add some script command about party and skill
script command :
IsMember, !IsMember ,RequestJoinParty
RequestOutParty,QuitParty,
MemberBuffs(character name, status name[id=XXX]) ,
!MemberBuffs(character name, status name[id=XXX])
this command check Self
CharBuffs(status name[id=XXX]), !CharBuffs(status name[id=XXX])
ps: here you founf offiel L2 walker...... http://www.towalker.com/english/index.html