Figuring out slots/ports in computer

I am wondering if there is a way to figure out how to find out whether you have an AGP slot or not WITHOUT opening the PC. Also, I want to know what kind of RAM my computer has WITHOUT opening the PC. I do know that it the computer came with 256MB DDR SDRAM memory running at 333Mhz, but not exactly sure what kind of memory to buy. Can anyone help me?

 

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