In a terminal window (this is standard behaviour):

à|ã|â|á|ä|	(Dead keys typed once, followed by other character)
`|~|^|'|"|	(Dead keys typed once, followed by space)
`|~|^|´|¨|	(Dead keys typed twice|) (note the different single- and double-quote marks!)


In a Sqeak Workspace:

a?|a?|a?|a?|a?|	(Dead keys typed once, followed by any other character)
`|~|^|'|?|	(Dead keys typed once, followed by space)
`|~|^|'|?|	(Dead keys typed twice)

As output of the command "showkey -a":

^@        0 0000 0x00	(ctrl/space as separator)
'        39 0047 0x27	single-quote, followed by space
^@        0 0000 0x00
´       194 0302 0xc2	single-quote, typed twice
        180 0264 0xb4
^@        0 0000 0x00
"        34 0042 0x22	double-quote, followed by space
^@        0 0000 0x00
¨       194 0302 0xc2	double-quote, typed twice (!)
        168 0250 0xa8
^@        0 0000 0x00
(ASCII/decimal/octal/hex)