The Universal World Owner's Manual

The 'Task' system is used to block the player for a period of time while they're occupied with some task. For example, you may want the player to have to wait for 30 seconds while they are crafting an item before it is added to their inventory. Here is a simple example demonstrating this system, that is triggered when the player uses the 'Flour' item:

Event("UseItem", "Flour" )
{
    *dotask %PLAYER% 40 Baking Bread
}

Event( "CustomTaskStart", "40" )
{
    // Specify that the task will take 30 seconds to complete..
    PlayerTaskStartSetTime( 30 )
}

Event( "CustomTaskComplete", "40" )
{
    *grantitem %PLAYER% 1 Bread
}