I think my last posting got lost, so here it is again: Yes, as was pointed out, the diacritical mark plus space will also produce the apostrophe, quotation mark, tilde, circumflex, hachek, accent grave, but not the accent aigu (acute ´) nor the umlaut (diaresis ¨). This is because umlaut/diaresis and quotation mark, and apostrophe and accent acute/aigu each share a key. AltGr-9 and AltGr-0 (zero) also are diacritical marks. Shifted, they can be applied. I am not certain what they are. AltGr-Shift-9 puts a mark over a 'g', as in Turkish, and AltGr-Shift-zero puts a circle over a 'y', and other vowels, as in Scandinavian languages. There may be others I haven't found. Another observation: if you set the menu key (at right, next to right control) to be the compose key, then it doesn't work in kmail (all of kde?). Set it to right win instead. Šheeşh¡ PS: The second 's' here, as appears in Turkish, was made using compose comma + 's'.
