Autocompletion for partially typesetted stuff in auctex.

[Hongyi Zhao]

The following description is an excerpt from
<https://www.gnu.org/software/auctex/features.html>:

  There is a completion mechanism for partially written macros
available as well.

But I want to know if it can help to complete the commands/macro names
defined in any packages called in the preamble of the current project
documents.

Any hints will be highly appreciated.

Regards
-- 
Assoc. Prof. Hongyi Zhao <hongyi.zhao@gmail.com>
Theory and Simulation of Materials
Hebei Vocational University of Technology and Engineering
NO. 552 North Gangtie Road, Xingtai, China