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wrap?

Hi,
    I'd really appreciate if someone can explain to me these commands:

(from test-suite-newreno.tcl):
:
:
set wrap 90
set wrap1 [expr 90 * 512 + 40]
:
:
elseif {$tcptype == "FullTcpTahoe"} {
  set wrap $wrap1
         set tcp1 [new Agent/TCP/FullTcp/Tahoe]
         set sink [new Agent/TCP/FullTcp/Tahoe]
:
:

thanks...

harlisya