ACM is the Association of Computing Machinery. It is one of the oldest computing societies in the world. ACM organizes various special intrest groups, including SIGGRAPH.
Visit the ACM website for more information.
UML is the Unified Modelling Language. It is a highly structured, object oriented methodology for software engineering. Currently, it is accepted as the defacto standard.
Virtual memory is a space in secondary memory (usually the hard drive) used to extend the "apparent" size of main memory (RAM). When all the RAM is currently in use, and more is needed, non-imperitve, low-priority, and/or suspended processes are paged out to virtual memory. Their process information is written to the harddisk, and the process image is deleted from the main memory, allowing a new process to begin.
Low levels of main memory on high power systems require almost the constant use of virtual memory, which can lead to thrashing.
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