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_extern int NC_SystemOpen( int Priority, int OpMode )这是什么函数

最近刚开始学6678,被一些函数卡住了。函数声明如下 _extern int  NC_SystemOpen( int Priority, int OpMode ),程序里找不到函数的详细内容。我感觉这是一个API函数,但是我在help contents里找不到NC打头的API,是不是我的help contents不全。如果不全的话我该怎么补充?还请大神们不吝赐教。