#NoEnv
#SingleInstance Force
Process, Priority, , High
SetWinDelay 0
; Replace "ThisClass" with the ahk_class of your PDF Viewer
GroupAdd, PDF_Group, ahk_class ThisClass
return ; end of auto-execute section
#IfWinActive, ahk_group PDF_Group
PgDn::
; If the target window does not receive the keystrokes reliably,
; try increasing the press duration via the second parameter of SetKeyDelay
; as in these examples:
; SetKeyDelay, 10, 10
; SetKeyDelay, 0, 10
; SetKeyDelay, -1, 0
Send {PgDn}
GroupActivate PDF_Group ; activate the next window of this group
Send {PgDn}
return
#IfWinActive
Esc:: ExitApp