System functions return information about the system metrics, color, and time. Following are the system functions:
| Function | Description |
| GetCurrentTime | Returns the time elapsed since the system was started. |
| GetSysColor | Retrieves the system color. |
| GetSystemMetrics | Retrieves information about the system metrics. |
| GetTimerResolution | Retrieves the timer resolution. |
| SetSysColors | Changes one or more system colors. |
| SystemParametersInfo | Queries or sets systemwide parameters. |
For detailed information about system functions, see the Microsoft Windows Programmer's Reference, Volume 2.