How to knoew what apps ara using more memory? aamnd how to find em?

my computer seem to be using alot of space and i think is mostly junk i need to no how to find outn wht is using it anh how to dlete it permantly?

Hello miukreb!
Please make at least a spell check before asking questions in the internet. Your text is difficult to understand.
You have a program called "Activity Monitor", which is showing everything you asked for (I think): you find it in the folder Applications > Utilities. This program shows you the memory used and the CPU.
If you meant your disk usage of your files you need an other program; for example "Disk Inventory X" or "WhatSize"
Best wishes for the New Year 2012!
marek

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