Help me for sending keys to a program

I have a dilemma,
I am using vb6, through my application I want to send some keys mentioned below to a application:
1. caption of application = "ODIN Client Ver10.0.0.2(Powered by FT-Engines)

2. Every time I close the application and restart it the class is different mentioned below are the 2 class id i got
Afx:00400000:8:00010011:00000000:000101AF
Afx:00400000:8:00010011:00000000:00030179

Now this class is of the main form there are many MDICHild form as well , so which ever is active child i wish to send the keys
1. shift + f12
2. wait of around 3 seconds
3. escape key
4. Down arrow Key / Up arrow Key to move focus within the MDICHILD window at different records.

Hope I am clear , I have tried many figureing out many options but honestly I am really weak when it comes to API's I also tried taking some tutorials, it did help but the purpose is not solved hope somebody helps me.
thanks in advance