Help with SendMessage to send text to another application

Hey all I'm new to the forum.

I am trying to pass a username & password to an application, and make it hit the "ok" button, using SendMessage.
The issue is that there are 3 text boxes on this logon screen. The first textbox is disabled. The second textbox is username, and the third is the password field.

They all have the same class of "Edit". How do I tell it which textbox to send the username to, and which to send the password to since they all have the same class?


Here is some info on why I'm needing to automate it.
The application that I'm trying to automate is used in our call center to display the statuses of all the reps that are logged in. So it tells us if they have had a customer on hold too long, how long they have been on a call etc...

I have setup a PC in our data center that has the call center app on it, and the video from that PC is sent out across the network to all of the TV's in the call center so that the supervisors can help reps with long calls as needed.

Unfortunately as it is right now, we have to remote in to that PC every morning and login to the app, then set our parameters and thresholds. I created a generic account to login with, now I just need to automate the login process.

All Help is appreciated!!!