Virtualbox mouse move in and out and file share with windows[通俗易懂]

How to use Virstalbox to share files with Linux and Windows, and to move the mouse in and out Virtualbox freely without click Ctrl key, herewith what I have done to achieve both.

1, download ‘VBoxGuestAdditions_4.3.12.iso’

2, in RH Linux of Virtualbox, access the iso file and install VBOXADDITIONS. 

a, [root@localhost VBOXADDITIONS_4.3.12_93733]# ll

dr-xr-xr-x. 2     2048 May 16 20:21 64Bit
-r-xr-xr-x. 1      647 Oct  9  2013 AUTORUN.INF
-r-xr-xr-x. 1     6966 May 16 20:12 autorun.sh
dr-xr-xr-x. 2     2048 May 16 20:21 cert
dr-xr-xr-x. 2     2048 May 16 20:21 OS2
-r-xr-xr-x. 1     5523 May 16 20:12 runasroot.sh
-r-xr-xr-x. 1  9942477 May 16 20:17 VBoxLinuxAdditions.run
-r-xr-xr-x. 1 20831744 May 16 20:35 VBoxSolarisAdditions.pkg
-r-xr-xr-x. 1 16917984 May 16 20:10 VBoxWindowsAdditions-amd64.exe
-r-xr-xr-x. 1   311584 May 16 20:01 VBoxWindowsAdditions.exe
-r-xr-xr-x. 1 10471664 May 16 20:02 VBoxWindowsAdditions-x86.exe

b, install and done, the mouse can move in and out freely

[root@localhost VBOXADDITIONS_4.3.12_93733]# ./VBoxLinuxAdditions.run 
Verifying archive integrity… All good.
Uncompressing VirtualBox 4.3.12 Guest Additions for Linux…………
VirtualBox Guest Additions installer
Removing installed version 4.3.12 of VirtualBox Guest Additions…
Copying additional installer modules …
add_symlink: link file /usr/lib/VBoxGuestAdditions already exists
Installing additional modules …
Removing existing VirtualBox non-DKMS kernel modules       [  OK  ]
Building the VirtualBox Guest Additions kernel modules
Building the main Guest Additions module                   [  OK  ]
Building the shared folder support module                  [  OK  ]
Building the OpenGL support module                         [  OK  ]
Doing non-kernel setup of the Guest Additions              [  OK  ]
Starting the VirtualBox Guest Additions                    [  OK  ]
Installing the Window System drivers
Installing X.Org Server 1.13 modules                       [  OK  ]
Setting up the Window System to use the Guest Additions    [  OK  ]
You may need to restart the hal service and the Window System (or just restart
the guest system) to enable the Guest Additions.
Installing graphics libraries and desktop services componen[  OK  ]

3, share the folder in Virtualbox and access windows folder in Linux

[root@localhost VBOXADDITIONS_4.3.12_93733]# mount -t vboxsf Downloads /mnt
[root@localhost VBOXADDITIONS_4.3.12_93733]# cd /mnt
[root@localhost mnt]# ll
total 16269
-rwxrwxrwx. 1 root root     282 Oct  4  2009 desktop.ini
…