Converted Pc user question

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Joined: 08/27/2005

I have been a pc user since they first came out and always wanted to try a mac. I am retired and on a limited budget when I found a place selling blue and white G3's for 89 bucks and couldn't resist. Even though it's only a 350 I am impressed. My question is I have installed both msn messenger and yahoo messenger and they are both working fine but whenever I open the programs there is an extra icon that looks similar to an external hard drive that pops up on my desktop. This doesn't seem normal but as I said I am new to Macs. Any help appreciated. I am running OS X 10.2.8 The Old Porker