System Variable Entry: SDI
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System Variable Entry: SDI
Name
SDI
Type
short integer, range 0 to 3
Default
0
Read-Only
yes
Scope
registry; saved in registry
Description
Single-document interface (Windows): Controls if a drawing is opened in a new application instance or an existing instance. Partially implemented: SDI variable controls double-click behavior for drawings, but it is still possible to open multiple documents in each application instance. Note: SDI setting 2 and 3 are not saved. If SDI is set to 3, the program switches it back to 1 when the application that doesn't support multiple drawings is unloaded.
Compatibility
AutoCAD and BricsCAD. AutoCAD all; BricsCAD V20+.
Source Notes
- AutoCAD: AutoCAD 2026 ENU per-sysvar page (name match; GUID not yet captured)
- BricsCAD: https://help.bricsys.com/en-us/document/system-variable-reference/s/sdi-system-variable