jump

JUMP  -  make a certain message be the current message

Usage:  JUMP message-number

At any point, MM considers one message to be "current".  At top-level,
  any command concerning a particular message makes that message be
  "current", so the command JUMP is almost unnecessary.  "Current" is
  a message-sequence that is the default for numerous commands.

Example:
    MM>headers 50  #shows header of 50, making 50 be "current"
    ... 
    MM>jump 14     #makes message 14 be "current"
    MM>headers     #default is "current"; now shows header of message 14

In the example, "headers 14" would have done the same as "jump 14"
  followed by "headers", so using "jump" is unnecessary.

For more help type "help" and one of these topics:
  message-sequence   headers   other