process_input() -  provide a hook for the driver to send a copy of what the
player is typing to the player object.

string process_input( string );

If process_input is present in the player object, then the MudOS driver
parser   will   send   it  a  copy  of  each  line  the  player  types.
Process_input makes it easy to implement features like command  history
and  protection  against  wizcuffs.   process_input can also modify the
player input before it is parsed.  If process_input returns a  non-zero
string,  that  string  is used by the driver instead of what the player
typed.

Truilkan@TMI