In another thread, I asked for help in adding a message to the DOSBox title bar when the mouse was locked inside the DOSBox window. Unless I'm missing something essential, it turns out to be ridiculously easy to do - at least it seems that way to me. Only three lines of code seem to be needed, and I'm not sure I really need all three.

Here's the diff file. In anyone thinks this is worth having, and can correct any errors or oversights, I'll be grateful.

Thanks again to ripsaw for pointing me in the right direction for this.