<P> Other graphical devices used in the computer user interface fulfill GUI functions on the system similar to the computer icons described above . However each of these related graphical devices differs in one way or another from the standard computer icon . </P> <P> The graphical windows on the computer screen share some of the visual and functional characteristics of the computer icon . Windows can be minimized to an icon format to serve as a hyperlink to the window itself . Multiple windows can be open and even overlapping on the screen . However where the icon provides a single button to initiate some function, the principal function of the window is a workspace, which can be minimized to an icon hyperlink when not in use . </P> <P> Over time, certain GUI widgets have gradually appeared which are useful in many contexts . These are graphical controls which are used across computer systems and can be intuitively manipulated by the user even in a new context because the user recognises them from having seen them in a more familiar context . Examples of these control widgets are scroll bars, sliders, listboxes and buttons used in many programs . Using these widgets, a user is able to define and manipulate the data and the display for the software program they are working with . The first set of computer widgets was originally developed for the Xerox Alto . Now they are commonly bundled in widget toolkits and distributed as part of a development package . These control widgets are standardized pictograms used in the graphical interface, they offer an expanded set of user functionalities beyond the hyperlink function of computer icons . </P> <P> Another GUI icon is exemplified by the smiley face, a pictogram embedded in a text message . The smiley, and by extension other emoticons, are used in computer text to convey information in a non-verbal binary shorthand, frequently involving the emotional context of the message . These icons were first developed for computers in the 1980s as a response to the limited storage and transmission bandwidth used in electronic messaging . Since then they have become both abundant and more sophisticated in their keyboard representations of varying emotions . They have developed from keyboard character combinations into real icons . They are widely used in all forms of electronic communications, always with the goal of adding context to the verbal content of the message . In adding an emotional overlay to the text, they have also enabled electronic messages to substitute for and frequently supplant voice - to - voice messaging . </P>

Where do graphics that serve a reference purpose belong