Pressing <F7> in insert or normal mode while
the cursor is touching a word will insert a command formed from the
word touching the cursor.
For certain common commands, Latex-Suite will expand them to include
additional arguments as needed. For example, frac
becomes \frac{<++>}{<++>}<++>. Otherwise, it will
simply change the word under the cursor as follows
word --> \word{<++>}<++>
You can define custom expansions
of commands using the Tex_Com_{name} setting as
described in here.
If <F7> is pressed when the cursor is on
white-space, then Latex-Suite will prompt you to choose a command and insert
that instead.The list of commands is constructed from the g:Tex_PromptedCommands
setting and also from commands which Latex-Suite finds while scanning custom
packages which Latex-Suite finds. See the Package actions section for details
on which files are scanned etc.
You can select a portion of text visually and press
<F7> while still in visual mode. This will
prompt you with a list of commands. (This list can be customized
via the g:Tex_PromptedCommands
setting). You can either choose from this list or type in a new
command name. Once the selection is done, Latex-Suite encloses the
visually selected portion in the chosen command.