How does gvim define the shortcut key ctrl+;?

Question

For example, gvim defines ctrl+; as the shortcut key to open or hide NERDTree, as follows:

 map <C-;> :NERDTreeToggle<CR>

is not recognized by gvim. Please give me some guidance from those who know it. Thank you very much.

Answer 1

The semicolon is written as map <c-;>是没有问题的
不过，vim无法捕捉到<c-;>，将用户输入的ctrl+;识别成;