On a Korean computer keyboard, the text is typically entered by simply pressing a key for the appropriate jamo; the operating system creates each composite character on the fly. Depending on the IME and keyboard layout, double consonants can be entered by holding the shift button. When all jamo making up a syllabic block have been entered, the user may initiate a conversion to hanja or other special characters using a keyboard shortcut or interface button; South Korean keyboards have a separate key for this. Subsequent semi-automated hanja conversion is supported to varying degrees in word processors.