▁a ▁classical ▁mole cular ▁dynamics ▁program , ▁to ▁simulate ▁complex ▁mole cular ▁systems ▁at ▁the ▁atom istic ▁level . ▁In ▁ 1 9 8 9 - 1 9 9 0 , ▁the ▁code ▁was ▁written ▁originally ▁by ▁Mass imo ▁Mar chi ▁during ▁his ▁stay ▁at ▁International ▁Business ▁Mach ines ▁( IB M ), ▁King ston ▁( USA ). ▁In ▁ 1 9 9 5 , ▁the ▁code ▁was ▁developed ▁further ▁at ▁the ▁Centre ▁europé en ▁de ▁calcul ▁atom ique ▁et ▁mol é cul aire ▁( CE C AM ). ▁It ▁is ▁written ▁in ▁the ▁programming ▁language ▁Fort ran . ▁In ▁ 1 9 9 7 , ▁it ▁was ▁released ▁under ▁a ▁GNU ▁General ▁Public ▁License ▁( G PL ). ▁The ▁latest ▁release ▁ ▁of ▁O rac ▁may ▁be ▁run ▁in ▁parallel ▁using ▁the ▁standard ▁Message ▁Pass ing ▁Interface ▁( M PI ) ▁libraries , ▁allowing ▁rep lica ▁exchange ▁simulations , ▁multiple ▁walk ers ▁met ad ynam ics ▁simulations ▁and ▁multiple ▁ste ered ▁mole cular ▁dynamics ▁none qu ilib rium ▁traject ories . ▁ ▁See ▁also ▁▁ ▁Com parison ▁of ▁software ▁for ▁mole cular ▁mechan ics ▁model ing ▁ ▁References ▁ ▁External ▁links ▁▁ ▁, ▁Univers ità ▁di ▁Fir enze , ▁IT ▁ ▁Category : F ort ran ▁software ▁Category : M ole cular ▁dynamics ▁software <0x0A> </s> ▁Neg ativity ▁is ▁the ▁fifth ▁album ▁by ▁American ▁ind ie - rock ▁band ▁De er ▁T ick . ▁The ▁album ▁was ▁recorded ▁in ▁Port land , ▁Oregon ▁with ▁Los ▁Lob os ' ▁Steve ▁Berlin . ▁Writing