When you touch something it heals you to full HP

From NWNWiki

[edit] When you touch something it heals you to full HP

Place In the OnUsed event of a Placable.

void main()
{
    object oPC = GetLastUsedBy();
    int nMax = GetMaxHitPoints(oPC);
    ApplyEffectToObject(DURATION_TYPE_INSTANT,EffectHeal(nMax),oPC);
}