3Com E4500-24 Cli Configuration Manual page 15

Press... To...
Use the partial online help. That is, when you input an
incomplete keyword and press <Tab>, if the input parameter
uniquely identifies a complete keyword, the system
substitutes the complete keyword for the input parameter; if
<Tab> more than one keywords match the input parameter, you can
display them one by one (in complete form) by pressing
<Tab> repeatedly; if no keyword matches the input
parameter, the system displays your original input on a new
line without any change.
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