What the hell is Hotswap?

Yeah ive seen this on afew threads and i got no idea what it is.

I assume its putting an item on your hotbar so you can quickly swap items, right?

Hotswap is:
1. Click on item what u using;
2. Drag it until the item with same type in ur banker;
3. Drop it.

Hotswap not work with keyboard shortcut.

It's basicially swaping your equiped stuff with the things in your bank but it doesnt seem to work in CM Servers anymore, guess they patched that( didnt really bother too much with it though as my PC Crashed and didnt boot for 3 days....)