can you help me with this script for tab completion?

can you help me with this script for tab completion?:
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Posted by lost in zmud 6.10 on November 10, 2000 at 15:07:57:

#TRIGGER {~(PK~) (%w)} {#VAR tab {%proper(%
1)};@tab(<%param1..%param99>);#TA @tab}
{tabupdate}

break it down for me because it is another language I don't understand...
what goes where.

thanks

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Comments:	> #TRIGGER {~(PK~) (%w)} {#VAR tab {%proper(% > 1)};@tab(<%param1..%param99>);#TA @tab} > {tabupdate} > break it down for me because it is another language I don't understand... > what goes where. > thanks