Memory Pages And Their Properties

A memory page may be marked as read-only (in which case any attempt to write into it will yield an exception) or read-write.

A memory segment may be either shared or private. A shared segment may be accessed by several different processes. Note that this page might be mapped onto different virtual memory segments in different processes.

In order to view disk paging activity, you may use the 'vmstat' command (e.g. 'vmstat 3' to see the status every 3 lines - ignore the first line of output!).