The ISPF Text-Editor is the free IBM Software, used to enter and store data in Mainframe Files. The ISPF Text-Editor is a power-packed word-processor with a plethora of advanced features, that save several key-strokes and time. Although there are other proprietary products such as File-Aid, ISPF Text-Editor is free, light-weight software.
ISPF Text-Editor supports Primary-Commands and In-line Commands. Primary-Commands are global, and affect the entire data-set such as FIND, CHANGE, SAVE, REPL, UNDO etc. You enter Primary-Commands on the command-line. Take a sneak-peek below, at how I entered the SAVE Primary-Command.
Line Commands apply to the current-line or Block-of-lines. You position the cursor against a Line as shown in the glimpse below, type a Line-Command like I, R, M, C, D, ( etc. and press <Enter>. Check-out, how I entered I-Insert Command against the second-line. 
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