DirectoryQ (Built-in Mathematica Symbol)

DirectoryQ["name"] gives True if the directory with the specified name exists, and gives False otherwise.

EvaluationNotebook (Built-in Mathematica Symbol)

EvaluationNotebook[] gives the notebook in which this function is being evaluated.

FieldMasked (Built-in Mathematica Symbol)

FieldMasked is an option to InputField that determines whether to mask user input.

FileFormat (Built-in Mathematica Symbol)

FileFormat["name"] attempts to determine what Import format could be used to import the file corresponding to " name".

HamiltonianGraphQ (Built-in Mathematica Symbol)

HamiltonianGraphQ[g] yields True if the graph g is Hamiltonian, and False otherwise.

ImageDimensions (Built-in Mathematica Symbol)

ImageDimensions[image] gives the pixel dimensions of the raster associated with an Image object image.

ImageQ (Built-in Mathematica Symbol)

ImageQ[image] yields True if image has the form of a valid Image object, and False otherwise.

LibraryLoad (Built-in Mathematica Symbol)

LibraryLoad[lib] loads the dynamic library lib into the Mathematica runtime.

Messages (Built-in Mathematica Symbol)

Messages[symbol] gives all the messages assigned to a particular symbol.

NumberFieldClassNumber (Built-in Mathematica Symbol)

NumberFieldClassNumber[\[Theta]] gives the class number for the algebraic number field \[DoubleStruckCapitalQ][\[Theta]] generated by \[Theta].