Control Keys

Normal keys (like A-Z, 0-9, Page Down, Tab, etc.) are represented by one character (foor example,  A-Z, 0-9) or special key syntax (<pgdn>, <tab>) that means "press-and-release" key.    Control keys (e.g., Alt, Ctrl, Shift, etc.) that changes keyboard context are different.  The first occurance of such key in the macro has meaning "press" key and the second occurance has meaning "release" key.   This means that, for example, "Ctrl+K" is represented as "<ctrl>k<ctrl>".