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Returns TRUE or FALSE depending on whether specified function exists.
| Number | Type | Compulsory | Default | Description | 
|---|---|---|---|---|
| 1 | string | Yes | 
 | Function name | 
| 2 | string | No | 'global' | Function type | 
Function name.
Either 'global' or 'script'. If 'global', arg 1 is assumed to be the name of a built in function. If 'script' arg 1 is assumed to be a function defined as a script and installed using the command RegisterUserFunction.
User defined compiled functions linked in as a DLL are treated as 'global'.
Return type: real
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