What are Logical patha nd physical paths?

Hi all,
When i am uploading Material master data through LSMW i am getting Error like The Logical file name LSMW_* ....is not created.
What are this Logical files and i know these are Created by FILE tCode.
My question is why we need this file and it asking Logical path aslo and what is this Logical path and physcal path??
i did't not understand in SAP help link .
Thanks ,
Madhu

Hello,
Logical File path name is used to Map the physical path of the application server.
You can also access the file from the application server by directly passing the physical path as you convert the logical file name to physical path in your program.
I know you have read the SAP help documentation, but still may be this link can also help you.
[http://help.sap.com/saphelp_nw04/helpdata/en/8d/3e4ec2462a11d189000000e8323d3a/frameset.htm]
Thanks,
Jayant

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