Under Microsoft Windows, the IDL Editor provides three ways of selecting text: stream mode, line mode, and column mode.
Switch between the three modes by clicking the right mouse button while positioned over an Editor window. Select the "Selection Mode" option to access a pull-down menu with the three text selection modes. The option with a check mark by it is the currently selected text selection mode. If you have text already selected, the selected area will change to reflect the new mode.