The command is called "dabbrev-expand".

I assigned it to my insert key with the following lines in .emacs:

(global-set-key [insert] 'dabbrev-expand)
(global-set-key [(meta insert)] 'overwrite-mode)


Heinz-Dieter Conradi wrote:
> 
> there is one feature in emacs i miss, which i found in the Alpha
> editor:
> 
> when typing a variable name, hitting control-tab tried to complete the
> name by using previously defined variables, methods, build-in names

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