Synchoronous Communication with Visual Basic

We will communicate a OW Xe System with a Visual Basic system.This will be a data transfer from Visual Basic to OW by means of Zfile upload.But we have to send a status message to Visual Basic system synchoronously as the upload takes place synchoronous.
Also VB program will send a message so that we will upload data into tables from ZFiles.
Is DCOM the best way to communicate with VB or using API's will help us for synchoronous communication.In SAP, Remote Function Call ( RFC ) like comm. interfaces helps for this kind of communication.
But in OW,I have to choose the best one.

Experts,come on and enjoy .....


<P ID="edit"><FONT SIZE=-1>Edited by huseyin_bilgen on 6/28/01 06:22 AM.</FONT></P>