A menu table - be it in the menus table or dynamic - must have a title item that determines the title, an items table which determines the menu items and which has tables of the following format in it: Remember, the script only supplies the player ID of the player who pressed the button.

Thus, a menu table should look like this:

Menus are opened by means of the unimenu function. It has the following arguments:

id - player ID to open the menu to. number
construct - construct the menu anew or use the cached version? boolean
m - menu to show. table/number/string
p - page of the menu to show. number

The most versatile and important argument is m.
Specify a dynamic menu table to open a menu out of that
Specify a menus table index to open a menu out of that
Specify the string "current" to open the currently opened menu

If you have a menu that is extensive but does not change, specify false as construct, so the script wouldn't construct a menu anew, but open the cached page.

Other variables include:

pmenu [table] - a table containing the last opened menu of each player (1 layer - pmenu[id])
spages [table] - a table containing actual menu strings for each page of the menu opened by a player (2 layers - spages[id][page])