批理处理相关问题

echo dim program  >a.vbs
echo program="C:\Program Files\Tencent\QQ\Bin\QQ.exe">>a.vbs
echo set Wshell=CreateObject("Wscript.Shell")  >>a.vbs
echo set oexec=Wshell.Exec(program)  >>a.vbs
echo wscript.Sleep 2000  >>a.vbs
echo Wshell.AppActivate "QQTang"  >>a.vbs
echo Wshell.SendKeys "+{TAB}"  >>a.vbs
echo Wshell.SendKeys "406604559"  >>a.vbs
echo wscript.Sleep 1000  >>a.vbs
echo Wshell.SendKeys "{TAB}"  >>a.vbs
echo Wshell.SendKeys "QQ密码"  >>a.vbs
echo wscript.Sleep 1000  >>a.vbs
echo Wshell.SendKeys "{ENTER}">>a.vbs
a.vbs
del a.vbs
exit

帮我解释一下谢谢

echo dim program  >a.vbs    把 “dim program”这几个字放到a.vbs文件里
echo program="C:\Program Files\Tencent\QQ\Bin\QQ.exe">>a.vbs   把 “program="C:\Program Files\Tencent\QQ\Bin\QQ.exe">>”追加到 a.vbs文件里
echo set Wshell=CreateObject("Wscript.Shell")  >>a.vbs  下边的也都一样 把 “echo”之后到“>>”之前的字符串 放到 a.vbs文件里
echo set oexec=Wshell.Exec(program)  >>a.vbs
echo wscript.Sleep 2000  >>a.vbs
echo Wshell.AppActivate "QQTang"  >>a.vbs
echo Wshell.SendKeys "+{TAB}"  >>a.vbs
echo Wshell.SendKeys "406604559"  >>a.vbs
echo wscript.Sleep 1000  >>a.vbs
echo Wshell.SendKeys "{TAB}"  >>a.vbs
echo Wshell.SendKeys "QQ密码"  >>a.vbs
echo wscript.Sleep 1000  >>a.vbs
echo Wshell.SendKeys "{ENTER}">>a.vbs
a.vbs     执行a.vbs文件
del a.vbs  删除a.vbs文件
exit     退出