@field

The @field command can be used to set an arbitrary field on an object. 
The name of this field will automatically be converted to lower case.
(Note: Not all fields can be set using this command. Particularly, you
cannot set any field with a space in its name.)

Usage:
@field me=va:423
@field dog=fur:brown
@field Tommy=ohomemsg:runs home to the Cafe.