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This is a special purpose function used to select a voltage or current signal source. It opens a dialog box whose controls are initialised according to the string passed as the function's arguments. It returns a string giving the definition of the source selected by the user. The string may be used as the value for a current or voltage source.
| Number | Type | Compulsory | Default | Description | 
|---|---|---|---|---|
| 1 | string | No | <<empty>> | Initialisation string | 
Return type: string
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