The program allows to hide and display all visible (invisible) windows, to protect the password their display (out of need). There is a support of hotkeys (concealment of an active window, concealment of badge Winhider from tray etc.). It is written on WinApi.has passed the test.
File list:
NA.bmp

winhider.cfg
winhider.dof
winhider.dpr
winhider.dsk
winhider.ico

winhider.rc
winhider.RES