Layer Name:  
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The name used behind the scenes to uniquely identify the name of the layer. It is the same name that is visible to everyone in the Tab Menu - Info tab. 
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Layer Type:  
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Point, line, polygon, etc. It is the same name that is visible to everyone in the Tab Menu - Info tab. 
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Data Source ID:  
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The ID used behind the scenes to identify the source of the data. 
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Server:  
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The name of the physical server. 
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Web Service:  
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The name of the web service used. 
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Web Method:  
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The name of the specific web method used. 
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Software:  
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The source software used to create the data displayed in the mapping window. 
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Database:  
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Oracle or SQL Server database name. 
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Schema:  
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Schema name. 
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Table:  
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Actual database table the data lives in. 
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Key Column:  
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The primary key field name for that data. 
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Geometry Column:  
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The table field name containing the actually geometry information. 
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File Name:  
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The name of the flat file used. For any particular layer the data displayed is either in a database table or a flat file. 
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File Location:  
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The actual folder path of the flat file. 
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Filter:  
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The part of the where clause used to limit what objects are displayed in the mapping window for a layer. For example, Fieldname = 'Some Code' 
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