# cmd

> [HTML Version](cmd_aui_control.htm)

Parameter _cmd_, a string of up to 199 characters, specifies the command, DLL, keystrokes, or object reference (according to _ctype_) associated with clicking on the control. The choices are:

•	[Windows Command Line](windowscommandline.md)

•	[Keyboard Commands](keyboardcommands_aui.md)

•	[Shell execute](shellexecute_aui.md)

•	[Subroutine (SBX)](subroutine(sbx).md)

**See Also**

•	The discussion on how to use an [Accelerator](accelerator.md) key

•	The commentary in [Modal Dialog Box Control](modaldialogboxcontrol.md) about customizing the "X" button behavior.