Their services are Web-based, meaning you have a Web browser to get into them online. chat networks are interoperable with services they are certainly not interoperable with each other. ICQ can be an instant messaging program that enables you to. This is really a completely free process and won't cost anything but a number of minutes of your time. You may be instant messaging all your Yahoo friends with MSN Messenger in no time. In addition for this, your personal machine must have no less than 128MB of RAM installed -- 64MB for Windows 98 and Windows ME -- and must have at the very least 30MB of free hard disk drive space to install the program.