how can i select lncRNA from Agilent RNA expression data

Question

[enterid]

I am very new to bioinformatics and so far belong to pure biological science domain.

I have been analyzing differentially expressed genes between tumors and normals for long non coding RNA using Agilent G4502A_07 RNA gene expression data from TCGA.

few questions below:

1. what is the different between this Agilent RNA gene expression profile and illumina_hiSeq_RNA seq V2 , apart from 2 platform were used

2. what is each column in the file mean or represent?

   3.how can i select the long non-coding RNA gene from the Agilent G4502A_07 RNA gene expression data