Returns the top-left and bottom-right corners of the video screen.

GetScreen(VAR x1, y1, x2, y2 : INTEGER);

Returns TRUE if the string parameter str can be converted into a numeric angle value, otherwise it returns FALSE.

ValidAngStr(str : STRING; VAR value : REAL) : BOOLEAN;

Returns TRUE if the string parameter str can be converted into a numeric value, otherwise it returns FALSE.

ValidNumStr(str : STRING; VAR value: REAL): BOOLEAN;

Returns TRUE if check box or radio button is checked, otherwise it returns FALSE.

ItemSel(fieldID : INTEGER): BOOLEAN;

Selects or deselects the check box or radio button which has that fieldID number.

SetItem(fieldID : INTEGER; select : BOOLEAN);

Hilites the text field which has that fieldID number.

SelField(fieldID : INTEGER);

Places text into a custom dialog text field.

SetField(fieldID : INTEGER; str : STRING);

Returns the text located in the text field which has that fieldID number.

GetField(fieldID : INTEGER): STRING;

Monitors user’s activity within a custom dialog box.

DialogEvent(VAR item : INTEGER);

Closes a custom dialog which is currently displayed.

ClrDialog;

Displays the dialog which has that dialogID number.

GetDialog(dialogID : INTEGER);

Creates a field within a custom dialog box.

AddField(fieldStr: STRING; ItemID, fieldType, x1, y1, x2, y2 : INTEGER);

Creates a button within a custom dialog box.

AddButton(buttonStr : STRING; ItemID, buttonType, x1, y1, x2, y2 : INTEGER);

Terminates the custom dialog creation process.

EndDialog;

Initiates the custom dialog creation process.

BeginDialog(dialogID, dialogType, x1, y1, x2, y2 : INTEGER);

Informs programmer whether the user click the cancel button.

DidCancel : BOOLEAN;

Dialog box that allows a user to input the 3D coordinate point.

PtDialog3D((DisplayStr, XStr, YStr, ZStr : STRING; VAR XPt, YPt, ZPt : REAL);

Dialog box that allows a user to input the 3D rotation angles of an object.

AngDialog3D(DisplayStr, XStr, YStr, ZStr : STRING; VAR XAngle, YAngle, ZAngle : REAL);

Dialog box that relays a message to the user.

AlrtDialog(Message : STRING);

Dialog box that allows a user to answer a yes/no question.

YNDialog(RequestStr : STRING) : BOOLEAN;

Dialog box that requests the user to input a string.

StrDialog(RequestStr, Default : STRING) : STRING;

Dialog box that requests the user to input a real number.

RealDialog(RequestStr, Default : STRING) : REAL;

Dialog box that requests the user to input a point X & Y coordinates.

PtDialog(RequestStr, DefaultX, DefaultY : STRING;  X, Y : REAL);

Dialog box that requests the user to input an integer number.

IntDialog(RequestStr, Default : STRING) : INTEGER;

Dialog box that requests the user to input an distance.

DistDialog(RequestStr, Default : STRING) : REAL;

Dialog box that requests the user to input an angle.

AngDialog(RequestStr, Default : STRING) : REAL;