Based on the habits of Bram 7 , without any plugin, you can do
1) Set the path to the headers (this is important for working with paragraph 2 below)
:set path+=/path/to/headers
2) Then run one of the following commands
[I Show the entire list in which the keyword under the cursor is in the header files or
[<Tab> will jump there, and you can return to your file using Ctrl + 6
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