Windows 2012、Windows 2008 Server命令行开启3389远程桌面，
命令行执行代码：
wmic /namespace:\\root\cimv2\terminalservices path win32_terminalservicesetting where (__CLASS != "") call setallowtsconnections 1
wmic /namespace:\\root\cimv2\terminalservices path win32_tsgeneralsetting where (TerminalName ='RDP-Tcp') call setuserauthenticationrequired 1
######只允许带网络级身份验证的远程桌面的计算机
// wmic /namespace:\\root\cimv2\terminalservices path win32_tsgeneralsetting where (TerminalName ='RDP-Tcp') call setuserauthenticationrequired 0
######允许任意版本远程桌面的计算机连接（较不安全）
reg add "HKLM\SYSTEM\CurrentControlSet\Control\Terminal Server" /v fSingleSessionPerUser /t REG_DWORD /d 0 /f
附Windows 2003命令行开启3389一句话命令：
REG ADD HKLM\SYSTEM\CurrentControlSet\Control\Terminal" "Server /v fDenyTSConnections /t REG_DWORD /d 00000000 /f