Final result:

/ / ------------------------------------------------ ----------------
/ / SET PIP CONFIGURATION
/ / Usage: <SetPip BigWindowName LittleWindowName>
/ / This command is called by <Hotkey F1> Which is defined below.
/ / ------------------------------------------------ ----------------
<Command SetPip>
<TargetWin %2%>
470 <SetWinSize 360>
1450 <SetWinPos 725>
<TargetWin %1%>
<SetWinPos 0 0>
1920 <SetWinSize 1080>
<TargetWin %2%>
<SetForegroundWin>
<UpdateWin>
<TargetWin %1%>
<SetWinRegion 360> 1450 725 470
<SetForegroundWin>

/ / ------------------------------------------------ ----------------
/ / TOGGLE PIP CONFIG WITH HOTKEY
/ / ------------------------------------------------ ----------------
ScrollLockOn <Hotkey F1>
<Toggle>
WoW1 <SetPip WoW2>
<Toggle>
Wow2 <SetPip WoW1>

The small window resolution is something ... Strange. There is nothing wrong about this?

Thanks for the responses, Bettysue are great!

PS: The Windows taskbar is no longer a problem ^ ^