code:
$letter = 'G:'
$path = '\\yeg01-nts-04\it_drive'
Gosub mapdrive
exit 0

:mapdrive
  $map = $map + 1
  ? 'Connecting to '+$path+' as '+$letter+' Drive'
  Use $letter $path
Return
And take a look at the UDF Forum which contains a couple of 'map drive' UDFs. UDFs are preferred over GOSUBS.
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There are two types of vessels, submarines and targets.