Usually because the command doesn't apply to a specific situation.For example: in MS-Word, the "Copy" command copies the selected text to an intermediate storage area called the "Clipboard". If NO text is selected (the cursor is between two letters), then there is nothing to copy, and the command is grayed out.
a Menu.
A menu bar is a graphical user interface (GUI) component which contains all the commands that may be executed according to the current context of an application. The menu bar typically appears at the top of the application window and will display the primary commands such as File, Edit, Tools and Help. Clicking one of these will reveal related commands within a drop-down sub-menu. For instance, clicking File will reveal the commands that may be executed upon files, such as New, Open, Save, Print and Close. Some commands may reveal more specific commands within another sub-menu. Commands that are outwith the current context of the application are typically disabled. For instance, if there are no files currently open, then the Save, Print and Close commands will be disabled. As the context of the application shifts, the menu bar will adjust accordingly, enabling and disabling commands as befits the current context. In some cases, commands may be hidden completely rather than simply disabled, only becoming visible when they are within context. For instance, when you open a specific type of document, commands that are specific to that type of document will be made visible. And if you switch between multiple document types, the menu bar will adjust accordingly. In modern GUIs, the menu bar is often hidden in favour of more graphical components such as tool bars and ribbon bars.
It depends on the context. Someone may be unavailable because they are away for some reason. A service may be unavailable due to technical difficulties. An item may be unavailable because it is out of stock.
It´s because you´re game may be corrupted!
Sugar was unavailable so the Sumerians used Honey.
yes
Seats may be unavailable on Delta due to high demand, limited availability, or because they have already been reserved by other passengers.
Delta may make seats unavailable for a variety of reasons, such as overbooking, maintenance issues, or to accommodate passengers with special needs.
Delta seat selection may be unavailable due to factors such as high demand, limited availability, or specific booking restrictions.
The image may be unavailable due to technical issues, such as a broken link or server error, or it could be restricted or removed by the website or platform hosting it.
Delta Comfort seats are unavailable on this flight because they may have already been booked by other passengers or the airline may not offer this seating option on this particular flight.
Community - 2009 Curriculum Unavailable 3-19 was released on: USA: 10 May 2012