I made a simple script with actools and it works but can anyone point me to the easiest way for injecting keystrokes into an application. Any information would be much appreciated. Game it's for is Heros Online and the anticheat doesnt bloick virtual keystrokes.

Look in the Help File:

These two are more for anything made by Turbine: Asheron's Call, Lord of the Rings, D&D Online, etc

Say
Saypaste

Most other games can use:
Keys

currently using the sendkey command but i want to send key to a nonfocused application.

You can't.