because doing it the simple way had problems.
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，详情可参考手游
The price upon introduction in 1991 was around $15,000 for a SPARCstation IPX complete with 19” CRT monitor, keyboard and mouse. Hence use tended to be limited to specialist applications and the one that I used around this time was employed in mobile data network conformance testing.
Dialog/file chooser/download surfaced as events，推荐阅读wps获取更多信息