持有D签证应该可以去其他申根国家，但不能超过六个月中的三个月。如有错误请纠正。
wikipedia上是这么说的：
“Category D refers to national visa. They are issued by a Schengen state in accordance with its national legislation as with respect to the conditions (however, a uniform sticker is used). The visa also entitles the bearer to stay in other Schengen countries for 3 months in 6 months.Before, April 5, 2010, travel to other Schengen countries was only allowed after the holder had obtained a residence title after arrival in the destination country, or they had been issued the (now defunct) C+D visa. ”
http://en.wikipedia.org/wiki/Schengen_area#cite_note-47