ers ▁to ▁purchase ▁a ▁computer ▁equ ipped ▁with ▁a ▁mode m , ▁so ▁as ▁to ▁ac quire ▁software ▁at ▁no ▁cost . ▁ ▁The ▁important ▁distingu ishing ▁feature ▁between ▁a ▁share ware ▁game ▁and ▁a ▁game ▁demo ▁is ▁that ▁the ▁share ware ▁game ▁is ▁( at ▁least ▁in ▁theory ) ▁a ▁complete ▁working ▁software ▁program ▁al beit ▁with ▁reduced ▁content ▁compared ▁to ▁the ▁full ▁game , ▁while ▁a ▁game ▁demo ▁om its ▁significant ▁functionality ▁as ▁well ▁as ▁content . ▁Share ware ▁games ▁commonly ▁offered ▁both ▁single ▁player ▁and ▁multi player ▁modes ▁plus ▁a ▁significant ▁fraction ▁of ▁the ▁full ▁game ▁content ▁such ▁as ▁the ▁first ▁of ▁three ▁episodes , ▁while ▁some ▁even ▁offered ▁the ▁entire ▁product ▁as ▁share ware ▁while ▁un lock ing ▁additional ▁content ▁for ▁registered ▁users . ▁By ▁contrast ▁a ▁game ▁demo ▁may ▁offer ▁as ▁little ▁as ▁one ▁single - player ▁level ▁or ▁consist ▁sole ly ▁of ▁a ▁multi player ▁map , ▁this ▁makes ▁them ▁easier ▁to ▁prepare ▁than ▁a ▁share ware ▁game . ▁ ▁Indust ry ▁standards ▁and ▁techn ologies ▁ ▁There ▁are ▁several ▁widely ▁accepted ▁standards ▁and ▁techn ologies ▁that ▁are ▁used ▁in ▁the ▁development ▁and ▁promotion ▁of ▁share ware . ▁FILE _ ID . DI Z ▁is ▁a ▁descript ive ▁text ▁file ▁often ▁included ▁in ▁download able ▁share ware ▁distribution ▁packages . ▁Port able ▁Application ▁Description ▁( P AD ) ▁is ▁used ▁to ▁standard ize ▁share ware ▁application ▁descri ptions . ▁P AD ▁file ▁is ▁an ▁XML ▁document ▁that ▁describes ▁a ▁share ware ▁or ▁fre ew are ▁product ▁according