Displays the amount of used and free memory in your system.

Syntax: MEM [/E] [/F] [/D] [/U] [/X] [/C] [/P] [/?]
  /E  Reports all information about Expanded Memory
  /F  Full list of memory blocks
  /D  List of device drivers currently in memory
  /U  List of programs in conventional and upper memory
  /X  Reports all information about Extended Memory
  /C  Lists conventional and upper memory use per module
  /P  Pauses after each screenful of information
  /?  Displays this help message
