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lastnextprevious is a Vim plugin that saves the user of typing repeatedly some movement (or action) commands that are short, but hard to press repeatedly (specially in some keyboard layouts).
With this plugin, when the user performs one of the configured movements by pressing the appropriate key strokes, the movement is performed as usual, but the type of movement is also saved ("last") for later. So if it has to be repeated ("next"), or it has to be performed in the other direction ("previous"), the user might save some inconvenient key pressing using the configured shortcut.
For example, moving one tab page backwards is not difficult: just press |gT|. However, if you want to review all tab pages one by one, your fingers will have to repeat gTgTgTgT... Likewise, imagine pressing repeatedly |g;| for revisiting the places where you did changes to a file, possibly reversing the sense of the movement: g;g;g;g,g;...
The solution offered is to press the keys for the desired movement first, then act as wanted on that place, and later, when needed, press a simpler key mapped to this plugin.
To see the full documentation, check the file in the "doc" directory, or see it online at:
https://raw.github.com/suy/vim-lastnextprevious/master/doc/lastnextprevious.txt
Or HTML formatted (thanks to Kana Natsuno's vim-doc.heroku.com) at: