X keyboards & international characters

[Collins Richey]

OK, we had the "Easy umlauts" series, but nothing seems to work for me,
so can we do some X basics?  I've spent days googling and man'ing
without coming up with any answers.  As usual with most things linux or
X, RTFM is great if you know which FM in advance <grin>.

1. Where do you find a description about the exact meaning of "PC101",
"PC104", "pickakeyboard layout", etc. ?  My keyboard is one of the usual
current generation with left and right CTL and ALT keys and the three
extra WinCruft keys.  What is the number?

2. Where do you find the meaning of cryptic keycode descriptors like
"AltGr-" ?

3. Where do you find the meaning of  "Compose Key" , "Meta Key" , "Mode
n", etc. ?

4.  My X config has the following layout, but I can't find any
combination of keys that will generate umlauts and other international
character.  What am I missing?

Section "InputDevice"
        Identifier  "Keyboard0"
        Driver      "keyboard"
        Option      "XkbRules" "xfree86"
        Option      "XkbModel" "pc104"
        Option      "XkbLayout" "us_intl"
EndSection

5.  Font selection is OK.  Emails display the appropriate umlauts, etc.

Your help would be appreciated.

-- 
Collins Richey - Denver Area
gentoo stable - ext3