Likely to be either infra red or Bluetooth, and then only if the PC supprts
them, ie has the kit to do so. A laptop will likely have infrared built in,
whereas you probably need to add a bluetooth option if thats what you want
to do. A desktop will likely have neither unless you have specifically
added them.
--
Regards
Ken....................... Microsoft MVP - Excel
Sys Spec - Win XP Pro / XL 97/00/02/03
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It's easier to beg forgiveness than ask permission

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