How do you use the alternate file register?
Answer
<C-r>#
Explanation
The # register holds the alternate (previously edited) filename. In insert mode, <C-r># inserts it. In normal mode, <C-^> switches to it.
<C-r>#
The # register holds the alternate (previously edited) filename. In insert mode, <C-r># inserts it. In normal mode, <C-^> switches to it.