The functions described in the following table must be included in your gauge DLL. These functions define the interface used by the Panel system to control the gauge. These functions are described in detail in the topics included in Exported Functions section of the Panels SDK.
| Function type and name | Description |
| INSTALL_ROUTINE | |
| install_routine | Called when the gauge is loaded. |
| INITIALIZE_ROUTINE | |
| initialize_routine | Called to initialize the gauge. |
| UPDATE_ROUTINE | |
| update_routine | Called when it is time to update the variables that refer to the gauge's drawing elements. |
| GENERATE_ROUTINE | |
| generate_routine | Called to re-initialize the gauge (for example, when the panel is resized). |
| DRAW_ROUTINE | |
| draw_routine | Called to draw the gauge to the panel window. |
| KILL_ROUTINE | |
| kill_routine | Called when the gauge is unloaded to free any memory used by the gauge. |