Dear Vishwanath
please check if there is the need to use "Bar Codes". If you you can assume that you need some kind of "add on" software. On Top check the need to prepare and install printer drivers. Further on: Implementation of GLM depends on release you use and if you would like to use new functions as available with EnhPAck7. But you need no additional servers (but WWI installaiotn in context of GLM is different; check corresponding cookbooks from SAP=. May be: What is a "Label" and how support SAP EHS Management "Labeling"
might help on top.
C.B.