如何确定在SSIS包中使用变量的位置或方式

I've inherited a collection of largely undocumented ssis packages. The entry point package (ie: the one that forks off in a variety of directions to call other packages) defines a number of variables. I would like to know how these variables are being used, but there doesn't seem to be an equivalent of "right click/Find All References"I've inherited a collection of largely undocume