Abstract: A Digital Oscilloscope has an information storage facility, a processor connected to the storage facility and having a data input, and a graphical display connected to the processor. The storage facility contains a multitude of functional tools for processing a signal from the input and for displaying a result on the display. The display has a control portion operable to display a selected limited subset of the tools. A limited subset of tools are selected from among the multitude of tools, and are displayed on a control portion of the display. The selection may be made manually by the user, or may be made automatically based on the user's recorded use of tools. Multiple subsets may be stored to enable different users to share the oscilloscope.