explain:

1. My computer installed multiple versions of solidworks (for example: solidworks 2015, solidworks2016)

2. I want to use vb.net to develop a program that used to launch the solidworks

I have three questions:

1. How to make the API to start the specified version of solidworks (For example: let the API starting solidworks 2015)

2. How to make the API start two same versions solidworks (for example: start two solidworks 2016)

3. How to drawing in the opened solidworks process