Thanks to ozak's function mentions:
Strict Local window:TGadget = CreateWindow( "Copy & Paste Test", 10,30, 400,200, Null,.. WINDOW_TITLEBAR | WINDOW_CLIENTCOORDS ) Local txt1:TGadget = CreateTextArea( 0,0, 200,200, window, TEXTAREA_WORDWRAP ) Local txt2:TGadget = CreateTextArea( 200,0, 200,200, window, TEXTAREA_WORDWRAP ) SetTextAreaText txt1, "The quick brown fox jumps over the lazy dog.~n~n" AddTextAreaText txt1, "Pack my box with five dozen liquor jugs." SelectTextAreaText txt1 GadgetCopy txt1 GadgetPaste txt2 Repeat WaitEvent Until EventID() = EVENT_WINDOWCLOSE