I use send hot key to trigger alt+tab to open window screen, but no work.
did it not work at all or did it just flash up for a second. to see the window screen normally you have to hit alt+tab then hold the alt while tabbing to the window you want…
I would choose a different method to address the window I need (like click on element on screen or attaching my activity to the window)
Try using Activate activity to activate your desired window and bring it into the foreground.