介绍了UG OPEN API函数以及如何用VC6.0对UG进行二次开发-Introduced UG OPEN API functions and how to use VC6.0 secondary development of UG

UG 二次开发时用到的一些命令，可以帮助学习UG-UG secondary development when some of the commands used to help learn UG

UG中实体边界自动延伸 UG中实体边界自动延伸 -UG The UG-entity boundary automatically extended entity boundary automatically extended UG-entity boundary automatically extended in the UG-entity boundary automatically extended