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

MEM [/PROGRAM | /DEBUG | /CLASSIFY]

/PROGRAM or /P Displays status of programs currently loaded in memory.
/DEBUG or /D Displays status of programs, internal drivers, and other
information.
/CLASSIFY or /C Classifies programs by memory usage. Lists the size of
programs, provides a summary of memory in use, and lists
largest memory block available.