Here's an AHK script that does what you need.
Copy in into a file, name it <whateveryouwant>.ahk.
Run it, and you'll see a timer at the top of your screen that counts to 100 over and over again forever.
Right-click to close, or right-click the tray icon and exit that way.
Code:
; simple timer OSD for randomizing
#singleinstance, force
#noenv
; USER SETTINGS
transparency = 200 ; set this between 0 (invisible) and 255 (completely solid)
speed = 1000 ; this number sets how fast the counter counts (1000 = 1 second)
fontsize = 50 ; self-explanatory
; END USER SETTINGS
gui +lastfound +alwaysontop -caption +toolwindow
gui, margin, 0, 0
gui, color, black
gui, font, cred s%fontsize%
gui, add, Text, vnumber cred +center, XXX
gui, show, x%xloc% y0 noactivate
gid := winexist()
winset, transparent, %transparency%, ahk_id%gid%
wingetpos, , , winw, winh, ahk_id%gid%
xloc := (a_screenwidth/2) - (winw/2)
winmove, %xloc%, 0
gosub, looptheloop
return
looptheloop:
loop, 100
{
guicontrol, , number, %a_index%
sleep, %speed%
}
gosub, looptheloop
return
guicontextmenu:
exitapp
.
