Differancec between local and sequential files

hi,
what is the differancec between local and sequential files

Sequential files are files with specific format. You upload data into SAP using sequential files.
ABAP allows you to use sequential files located on the application server or presentation server. You can use these files to buffer data, or as an interface between local programs and the R/3 System
Sequential files are the files which are stored at application server
To read them or to put the data into them we use the DATASET concepts for transfering data
OPEN data set is used to open the file
READ dataset for reading the file
TRANSFER dataset for transfering/writing the data
CLOSE dataset to close the dataset.
Local file is nothing but ur local system file ..Like C:\, D:\

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