▁allows ▁two ▁users ▁to ▁work ▁collabor atively ▁or ▁to ▁play ▁against ▁each ▁other . ▁ ▁Consider ing ▁multiple ▁switch ▁access ▁is ▁important ▁for ▁users ▁accessing ▁more ▁advanced ▁activities ▁through ▁switch ▁access ▁sc anning . ▁This ▁is ▁usually ▁determined ▁by ▁their ▁physical ▁capabilities . ▁A ▁single ▁switch ▁requires ▁less ▁physical ▁control ▁and ▁is ▁usually ▁less ▁t iring ▁to ▁access ▁but ▁it ▁reduces ▁sc anning ▁options ▁and ▁usually ▁leads ▁to ▁a ▁slower ▁rate ▁of ▁input . ▁Single - switch ▁sc anning ▁also ▁requires ▁much ▁greater ▁concentration . ▁Two - switch ▁sc anning ▁enables ▁a ▁range ▁of ▁sc anning ▁options , ▁including ▁row - and - column ▁and ▁o vers can . ▁These ▁can ▁greatly ▁increase ▁input ▁rates ▁and ▁can ▁make ▁using ▁a ▁computer ▁or ▁electronic ▁assist ive ▁device ▁far ▁more ▁comfortable ▁and ▁efficient . ▁ ▁Category : Comput er ▁access ibility ▁Category : User ▁interface ▁techniques ▁Category : E du c ational ▁technology ▁Category : Ass ist ive ▁technology <0x0A> </s> ▁Rang ipo ▁Des ert ▁is ▁a ▁bar ren ▁desert - like ▁environment ▁in ▁New ▁Zealand , ▁located ▁in ▁the ▁R ua pe hu ▁District ▁on ▁the ▁North ▁Island ▁Vol can ic ▁Pl ate au ; ▁to ▁the ▁east ▁of ▁the ▁three ▁active ▁pe aks ▁of ▁Mount ▁T ong ari ro , ▁Mount ▁N ga uru ho e , ▁and ▁Mount ▁R ua pe hu , ▁and ▁to ▁the ▁west ▁of ▁the ▁Ka iman awa ▁Range . ▁ ▁The ▁Rang ipo ▁Des ert ▁receives ▁ ▁of ▁ra inf all ▁per ▁year , ▁but ▁res emb