00374    a2200145   4500020001500000082001300015100001700028245008000045250000800125260003200133300001500165650002100180700001700201700001000218  a0619254890  a004bSHE  aShelly, Gray  aEssential introduction to computers and how to purchase a personal computer  a6th  aBostonbThomsomc2006g2006  a40p.c28cm  aComputer science  aCashman, Tom  aGroen