2 SWAP
SWAP allows you to change your username, etc. without logging out.
Format:
        SWAP  username

It is handy for a privileged user to do some work in another user's
account, and then return to their own account.  SWAP changes username and
account, UIC, privileges, default device and directory, and process name,
and displays the number of new mail messages but does not run any LOGIN.COM
or alter quotas.

It allows unprivileged users to swap between usernames they own
if they are specifically enabled by the system manager.  MAIL to MANAGER.

This command can cause accounting problems, as all CPU time is charged to
the username in effect at logout time.  It should therefore be used only for
short pieces of work where accounting is not important.  You should
typically return to your original username before logging out.  It is also
typically symmetric, that is, if you can swap to another username, that
username can swap to yours.

To enable this command, put the line
$ SWAP :== $SYS$SYSTEM:SWAPPAIR
into your LOGIN.COM command procedure file.  MAIL request to MANAGER.
3 Parameters
username  destination username must be a username authorized
          for the current user by the System Manager.
3 Process_name
The username is appended to the translation of the logical name ME$PROC
and the result becomes the process name.  If there is not enough room,
the translation of ME$PROC is truncated to fit.

To use this feature, include the line
$ DEFINE  ME$PROC  "string"
in your LOGIN.COM command procedure file.
3 Original_username
The original username is kept in the logical name ME$USER .

