I found some new window hiders (that are at least less than 2-3 years old)
http://www.eusing.com/hidewindows/bosskey.htm
http://hidetools.com/fast_windows_hider.html
http://codecaged.com/windows-hider
Please make them portable apps.... 
Thank you.
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Clicky Gone Portable - easily hide running windows https://portableapps.com/apps/utilities/clicky-gone-portable
Don't Panic! Portable - one-click application hider https://portableapps.com/apps/utilities/dont_panic_portable
P.S. please do your own homework in future because some time around now I say something sarcastic and then a shitstorm breaks out.
Wm
Clicky gone: worked for like two days before errors started to sprout up like weeds.... -.-
Don't panic: didn't work AT ALL and I mean NOT AT ALL.... -.- (tried reinstalling, restarting PC, reinstalled the PA platform, even downloaded the normal version) nothing worked.... -.-
Besides, clicky gone is like 3 years old; anyone can see that that project is dead (no wonder there are so many errors) and, well, don't panic doesn't work, so, it doesn't matter if it's quite new....
That's why I did some searching and found some window hiders that work, and are quite new (as I said, less than 2-3 years old)
So please ask before jumping to conclusions.... -.-
Thank you.
I love PortableApps! ❤❤❤
part of the reason hiding what you are doing has gone out of fashion is because it isn't really necessary any more. mind you, I don't watch p*rn in inappropriate situations. hiding the screen may have made sense back in the 80's and 90's but is pretty irrelevant these days as a serious anonymity or similar defence.
Now, presuming you have a need for hiding what you are doing from you parents or whoever why don't you get to work making a hider? It is you that wants it, after all.
Age shouldn't be a barrier to intelligence but I'm guessing you are a teenager.
Wm
I'll make my own window hider and package it as a portable app myself....
And yea, I'm a teenager and no, I do not watch p*rn.....
And I'm not hiding anything from my parents; I run so many processes that the task bar is completely full.....
So a window hider comes in handy....
I love PortableApps! ❤❤❤