On most windows systems ctrl+PgUp is the equivalent of the Alt+Tab key without the fancy selector screen. Odds are it's performing an alt tab to your first screen, and then because the mouse is controlling which window has focus your keys are continuing to be sent to the desired window.
If you have determined that this is not your problem then please
copy and paste your macro for follow. First look you have the script and macro you typed matching, I just fear you may have a space or return character in the macro editor screen without realizing it.
Here is a decent list of the available keys for multiboxing, everything with an 8 in the far right column is best, and yes PgUp is one of them, I'm not sure if HKN stops the tabbing behavior though it should.
http://www.dual-boxing.com/wiki/inde...ld_of_Warcraft
The following is a list of default keybinds in WoW please note that ctrl-pgup is bound to combat log up, and pgup alone scrolls your chat log to the top.
http://www.mldev.com/pages/warcraft/wc_keys.htm
One other thing if you want to save yourself 6 characters, /follow can have the same parameters /target can so you can just put /follow [mods,target][mods,target] etc
Hope that helps a bit
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