Hi, i have ceratin questions and i hope to find my answers here. 1.what is the difference between a ddr and sdr ram.i am planning to upgrade my ram to 1gb and i have a p4-2.4ghz system with 256ddr ram with xp professional as os.sdr ram is quiet cheap compared to ddr.which is better and whats the difference. 2.all these time i have been using an ordinary mobile phone, very recently i brought a nokia 3230 with 512 memory card from a nokia priority dealer with softwares uploaded.but i dont now how to connect my phone to my pc. can i do it through a memory card reader-how does one use it?it is just 250.but should i always emove my memiry card from my phone. 2.data cable?its a bit costly? 3.what i have to do to mak my pc a blue tooth.whats the price of that device and is it internal or external. 4.how much is infrared for pc and wether it is internal or external. these questions may sound silly for you high tech guys but remember i am a no vice a complete no vice. kindly help thanks a lot.