🚀 go-pugleaf

beaurega@ireq.hydro.qc.ca (Denis Beauregard) writes:

>In your example, prthru is a Windows program calling tn3270, a Windows
>program too, so int 05 and 09 are catched.  If, however, prthru and
>tn3270 are both DOS programs (i.e. Windows will install DOS prompt before
>running prthru), then you should be able to intercept printscreen, but only
>if the DOS window is active.  It is like a program writting directly to
>the screen (like a text editor I wrote years ago).  In the DOS window,
>the editor writes to the video memory directly so that in DOS full
>screen, the video memory is not intercepted.  However, in DOS window
>with Windows active, when the editor writes to the screen, Windows intercept
>the character, and re-write it on the copy of memory video in the DOS window.

But since they're both DOS programs, redirecting the keyboard interrupt
would work, in the box.  Only in the foreground?  How the *heck* are you 
going to press PRTSCR in a background box?  Why would you do it?  (anyway,
tn3270 runs full-screen by default)...

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