You want to make shure that you can take memory out of the system to use elsewere.
Some old driver does not support over 640 MB of memory or you just want to take something for another machine.
You edit the boot.ini file and add the /maxmem=256 parameter. (change the value appropriatelly)
e.g. multi(0)disk(0)rdisk(0)partition(1)winnt="Windows NT" /MAXMEM=256
PS: try this out on the machine of some colleagues (do not forget to take your changes back!)
About the Author
Wim Peeters is electronics engineer with an additional master in IT and over 30 years of experience including time spent in support, development, consulting, training and database administration. Wim has worked with SQL Server since version 6.5. He has developed in C/C++, Java and C# on Windows and Linux in different European countries and different European languages. He writes knowledge base articles to solve IT problems and publishes them on the Lubby Knowledge Platform where he is one of the most important contributors and the main developer.