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The following features do not work on an RT target:

• ActiveX VIs
• .NET VIs
• TestStand VIs (ActiveX-based)
• Report Generation Toolkit VIs
• Windows Registry Access VIs
• Report Express VI (Uses the unsupported Report Generation Toolkit VIs)
• Graphics & Sound VIs
• Database Connectivity Toolset
• G Web Server
• LabVIEW MathScript
• Menu functions
• Cursor VIs
• IrDA functions
• Call Library Function Nodes that access an operating system API other than ETS
• Open/Create/Replace File function interactively using a file dialog box
• The Clear indicators when called option of the Execution Properties page is not supported on RT targets.
• The Auto Configure option of the Create Histogram Express VI is not supported on RT targets.
• File and folder access restrictions are not enforced on RT targets.

Modifying Front Panel Objects of RT Target VIs

When a VI or stand-alone application runs on an RT target, you cannot execute VIs that modify a front panel. For example, you cannot change or read the properties of front panel objects with property nodes because there is no front panel for VIs that run on the RT target. The VI still runs on the RT target but the front panel object is not affected and returns an error. In some cases, you can establish a front panel connection with the RT target to use some unsupported LabVIEW features. Right-click an RT target in the Project Explorer window and select Connect from the shortcut menu to open a front panel connection with the target.

The following features only work on an RT target with a front panel connection:

• Front panel property nodes and control references.

  Note  An RT target updates the values of property nodes and control references asynchronously, meaning a property node or control reference might not contain the latest value of the indicator or control.

• Dialog VIs and functions
• VI Server front panel functions

Note  Some LabVIEW example VIs use unsupported VIs and functions and do not execute on an RT target.

Real-Time Module and Express VI Considerations

LabVIEW Express VIs increase LabVIEW ease of use and improve productivity with interactive dialog boxes that minimize programming for measurement applications. Express VIs require additional performance overhead during execution; therefore, do not use Express VIs in deterministic or processor-intensive applications. Instead, develop real-time applications with standard LabVIEW VIs.