org: Completion
15.1 Completion
===============
Emacs would not be Emacs without completion, and Org mode uses it
whenever it makes sense. If you prefer an iswitchb- or ido-like
interface for some of the completion prompts, you can specify your
preference by setting at most one of the variables
‘org-completion-use-iswitchb’ ‘org-completion-use-ido’.
Org supports in-buffer completion. This type of completion does not
make use of the minibuffer. You simply type a few letters into the
buffer and use the key to complete text right there.
‘M-<TAB>’
Complete word at point
• At the beginning of a headline, complete TODO keywords.
• After ‘\’, complete TeX symbols supported by the exporter.
• After ‘*’, complete headlines in the current buffer so that
they can be used in search links like ‘[[*find this
headline]]’.
• After ‘:’ in a headline, complete tags. The list of tags is
taken from the variable ‘org-tag-alist’ (possibly set through
the ‘#+TAGS’ in-buffer option, 
Setting tags), or it is
created dynamically from all tags used in the current buffer.
• After ‘:’ and not in a headline, complete property keys. The
list of keys is constructed dynamically from all keys used in
the current buffer.
• After ‘[’, complete link abbreviations (Link
abbreviations).
• After ‘#+’, complete the special keywords like ‘TYP_TODO’ or
‘OPTIONS’ which set file-specific options for Org mode. When
the option keyword is already complete, pressing ‘M-<TAB>’
again will insert example settings for this keyword.
• In the line after ‘#+STARTUP: ’, complete startup keywords,
i.e., valid keys for this line.
• Elsewhere, complete dictionary words using Ispell.
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