MEM

Display memory usage.

syntax
      MEM 
      MEM /C
      MEM /D
      MEM /P

key
   /P   List programs in memory
        with the memory address and size of each 

   /D   List Programs(as /P) and also Devices

   /C   List programs in conventional memory and
        list programs in upper memory

MEM will only display details about the current CMD shell environment, programs running in a separate shell (or WIN32 programs) will not be listed - so it won't tell you anything about total memory usage.

"Some people get lots of pleasure; From books or from music or art; But boys seem to think it's fantastic; To just have a really good fart." - Purple Ronnie

Related Commands:

DisablePagingExecutive - Q184419 (use this when >500M RAM is available)

Increase desktop heap memory for non-interactive processes - Q126962 (SharedSection=1024,3072,3072)
note that NT 4 has a system wide limit of ~48MB for all desktops, so a 3M heap will allow a max 16 processes while 512K heap will allow a max 96 processes.

CLEARMEM (Resource Kit) - Clear Memory Leaks
WINMSD - Windows NT Diagnostics (including Physical Memory)
GUI Task Manager - for all program details including Win32 applications.
TLIST - Task List

Equivalent Linux BASH commands:

free -t - Display a summary of current memory usage and availability.