I've got this info from pressing F10 and Setup Screen:
Memory: 128 MB / 133 MHz
Serial Number: 6051FZ4ZC274
Proc: Pentium III 800 MHz
But I don't know what exact model it is. I know there are EX, EXD, EN, ENL and the ES series.
I'm not allowed to open the desktop, but I need to know what bank of memory it is using, in order to put another one and increase memory. I would like to know how many bank-slots that it has. I think there are 4 bank-slots, and memory banks work in pair.