substr() - returns a substring of string
RETURN_VALUE = substr(STRING_TO_CUT,START_POSITION,LENGTH_OF_SELECTION)
substr($,1,2)+SubSTR($,4,1)+SubSTR($,6)
is:
substring from $ (which is workstation-name) characters 1-2 and 4 and 6 and anything beyond.
so, character 3 and 5 are subtracted.
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