connect a legacy system to SAP by ALE

Dear firends,

I have a legacy system in VB for venodor details, I wish to integrate it with SAP. but don know the procedure... i feel ALE can help in this regards as i am looking for it in real time rather uploading the data by batch upload. please explain me the process of it.. i know the configuration of ALE but don know the receiving part from the outside of SAP... please help in this regards..any article.. process, will be great help of mine..

thanking u.

Naim