DDL (Device Driver Load)
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    SYNTAX: DDL <device pathname> [<device parameters>]
    
    This loads a device driver  without  the  need to reboot the computer.
    The full pathname is required, parameters for the device driver may be
    specified. This can be especially useful  when loading a device driver
    that is only  occasionally  used.  So,  to  load  the  ANSI.SYS device
    driver, type:
    
       DDL C:\DOS\ANSI.SYS
    
    
                          DDU (Device Driver Unload)
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    SYNTAX: ddu <device name>              or...
            ddu <drive letter>:
    
    This unloads a device driver  that  has  been  loaded using DDL. Other
    devices may not be unloaded. If unloading a block device such as a ram
    disk, all units of  that  device  will  be  unloaded. The drive letter
    specified must also be the first  unit  of the device. That means that
    if the device driver loads drives E: and F:, you must specify drive E:
    to unload, and both will then be  unloaded).
    
    Block devices must be unloaded in the reverse order to which they were
    loaded. To unload a ram drive called E: type:
    
       DDU E:
    
    
                          LDD (List Device Drivers)
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    Syntax: LDD
    
    Lists all loaded device drivers. If  they  did not alter the interrupt
    vectors, device drivers  loaded  using  DDL  are  high-lighted with an
    asterisk, otherwise with an exclamation mark.
    
    P. Frost 1991