Another discovery (may be some of you know this already).

first click "ctrl + backspace", this will show you all the open programs.

then click 1, 2, 3 to open the respective programs.

Like if the first open program is conversations, then clicking 1 will open conversations.

afaik, the best way to achieve ALT + Tab feature

but also it doesn't work for more than 3 programs I guess. when i click Ctrl + backspace and then 4 or 5, the respective program doesn't open. I guess its some kinda bug? please fix it