Seeing other mesh vertices while editing another one? How can I make it so that I'm able to see the vertices of other meshes while I'm editing other ones, if it's possible?

What I'm trying to accomplish is seeing one mesh's vertices while working on a separate mesh entirely.

So is this possible?
If you just need to display the edges, you can select the object, go in the Properties panel > Object > Display > Click on Draw All Edges and Maximum Draw Type > Wire.

But otherwise there is an addon called MultiEdit: https://www.dropbox.com/s/xtxbhxxw9qriti2/MultiEdit_1_0.zip?dl=0

Download and install it, then select both your objects and, in the left panel (activated with T) > Tools > Multiple Objects Editing > click on the MultiEdit Enter button. Click on the MultiEdit Exit when you have finished.