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Returns the current setting of the bitmap in the current configuration file and turns off-screen bitmaps off or on at run time.
SYS(602 [, 0 | 1 ])
Parameters
- 0
Turns off off-screen bitmaps at run time. - 1
Turns on off-screen bitmaps at run time.
Return Values
Character data type. The following table lists the possible settings that SYS(602) can return.
| Return value | Setting |
|---|---|
| 0 | Off-screen bitmaps are turned off. |
| 1 | Off-screen bitmaps are turned on. (Default) |
Remarks
You can use off-screen bitmaps to store an image of the current desktop and forms so that you can render them if another element, such as a window, is drawn over them. However, off-screen bitmaps use a lot of memory, so you can improve performance on Terminal Server applications by turning these bitmaps off using SYS(602).
However, be aware that toggling off-screen bitmaps can affect your application. For example, form controls can appear normal, however, writing directly to a form using a method such as Line requires off-screen bitmaps to be turned on.
If you want to determine whether an application is running on a Terminal Server, use OS(10).
See Also
SYS( ) Functions Overview | OS( ) Function | Special Terms for Configuration Files