Are you on a PC or a MAC

I had trouble downloading an operating system upgrade for a PDA, so I called tech support.

• Me: "I can't seem to get this download to complete. What might be causing it?"
• Tech Support: "What operating system are you running?"
• Me: "Windows NT."
• Tech Support: "Well, you have to be running Windows 98 or better in order to download it."
• Me: "Ummm, I am. I'm running Windows NT4, SP5."
• Tech Support: "Are you on a PC or a MAC?"