I have seen people using it.. But exploring a computer is the assumption i take from you when you mean using the system. It was a windows 2000.. Pretty advanced OS i should say. I have a special liking towards that OS. Now i have hands on experience on the new and very old operating systems...

My first system was some IBM PC. I don't remember the generation or model for it. I was 12 yrs old

My dad taught me how to use it. I don't even remember the exact specifications. It was loaded with DOS initially, and later Windows 3.1.

I still like Windows 3.1 bcoz of the interface.

I think it also had a 5 1/2 " Floppy drive bay.

well lets see here, that was a IBM 8088 and a Tape Drive. yes a cassestte drive. only Dos, and the monitor was a old BW TV
Them was the days. Someplace I still have the old thing. will have to search and see if it still works

My dad built me a computer when i was 3.
I loved it, and spend age on it each night, gradually building up my knowledge.
By the time i was 7 I knew more than all of my classmates (most of them only used computers in school)
And now, im a complete and utter 'GEEK'
And im loving it!!!!

Well its useful anyway!

Speaking of first computers, the first "Proper" PC i got was a 386SX, 25mhz with 40mb Hard Drive and a 3.5 FDD, and a external 5.5 FDD. The brand was Amstrad (now defunct), which at the time was a okay brand, however it was difficult to upgrade some parts considering the parts Amstrad used was different to other manufacturers around at the time (Compaq, HP, even Commodore, etc).