Open All Documents in One MDI Application with Help of Dynamic Data Exchange Technology under VB 6.0
VB 6.0中运用DDE技术实现MDI关联文档仅在一个主窗体中打开

It can reduce OS spending for there is only a piece of process in system when you use a MDI application to deal with many documents. There is no direct property, method, event to let your programme to have the function that open all correlated documents double-clicked in one instance in VB 6.0. This paper demonstrates how to solve this problem with DDE, lists detailed codes, and provides the way of validity check.