Problems binding odd C- & M-keys in Elisp

[Joe Fineman]

I can bind commands to the following odd combinations using M-x
global-set-key, but I cannot figure out how to express the same
bindings in Elisp for inclusion in .emacs:

C-; ("\C-\;" gives "Invalid modifier in string")
C-<tab> ("\C-\t" gives the same)
M-<left>
M-<up>

What am I missing?
-- 
---  Joe Fineman    joe_f@verizon.net

||:  Vulgarity is the garlic in the salad of taste.  :||