RegisterHotKeys and global keyboard hooks?

What are RegisterHotKeys and global keyboard h开发者_如何学JAVAooks, and how do they work?

I want to make a key to get focused on my application's Form (when it's minimized) and then focus on a textbox, so from what I've read I need to use the RegisterHotKeys function (that's a better solution for my needs), but i couldn't find how or where I can choose my own key (only one key - ESC) and then command it to focus on my form, and then on the textbox.

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Sample on how to use hot keys.

class myform : Form
{
    public myform()
    {
        RegisterHotKey(Handle, id, modifiers, mykey);
    }
    protected override void WndProc(ref Message m)
    {
        if (m.Msg == 0x312) // this is WM_HOTKEY
        {
            Show();
        }
        base.WndProc(ref m);
    }
}