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ecovery or data movement.
Hex Function: Returns a string that represents the hexadecimal value of a number argument.
Hour Function: Returns a number between 0 and 23 representing the hour portion of the specified time.
IIf Function: Returns one or two parts depending on the evaluation of an expression. For example, the syntax IIf(TestMe > 1000, "Large", "Small") evaluates the first argument and if it''''s true, returns the string "Large" and if it''''s false, returns the string "Small".
Independent Software Vendor (ISV): A vendor that develops software. This signifies that the vendor specializes in software, not hardware.
Input Function: Returns characters read from a sequential file opened in Input mode.
InputBox Function: Displays a prompt you specify in a dialog box, waits for the user to input text or choose a button, and returns the contents of the textbox. An efficient way to get user input without creating a separate form and writing code for it.
InStr Function: Returns the position of the first occurrence of a string within another string.
Int, Fix Functions: Return the integer portion of a number.
Integrated Development Environment (IDE): A set of integrated tools for software development, run from within a single user interface. These tools can include a compiler, debugger, and text editor. When you open VB, you are in the VB IDE.
Intrinsic Control: A control that always appears in the VB toolbox (such as the combo box, the data control, or the frame controls) and cannot be removed.
Intrinsic: A control that HTML supports directly, without requiring VBScript for implementation.
IPmt Function: Returns the interest payment for a given period of an annuity based on periodic, constant payments, and a constant interest rate.
IRR Function: Returns the internal rate of return for a series of periodic payments and receipts.
IsDate Function: Returns a value indicating whether an expression can be converted to a date.
IsEmpty Function: Returns a value indicating if a Variant variable has been initialized, and only works with variables of the Variant data type.
IsNull Function: Returns a value indicating whether an expression contains a Null value. Will return False if the expression contains a zero or an empty string.
IsNumeric Function: Returns a value indicating whether an expression can be converted to a numeric data type.
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KeyDown Event: Occurs when the user presses a key while an object has focus.
KeyPress Event: Occurs in the object that has focus when the user presses and releases any ANSI key on a keyboard.
KeyUp Event: Occurs in the object that has focus when the user releases a key.
Late Binding: Also called dynamic binding, this links a routine or object at run time. Late binding is less efficient because of the overhead of binding while the program is running. See also: Early Binding.
LBound Function: Returns the smallest available subscript for the indicated dimension of an array. This function returns the lower limit of an array and can be used with UBound to find the size of an array. If you create an array of elements from 1 to 100 LBound(Array) returns 1. See also: UBound Function.
LCase Function: Returns a string in which all letters of an argument have been converted to lowercase.
Learning Edition: Version of VB designed for students or hobbyists learning Visual Basic.
Left Function: Returns the left-most n characters of a string argument.
Len Function: Returns the number of characters in a string expression or the number of bytes required to store a variable.
LinkClose Event: Occurs when a DDE conversation terminates.
LinkError Event: Generated when an error occurs during a DDE conversation. Recognized as the result of a DDE-related error that occurs when no VB code is being executed. The error number is passed as an argument.
LinkExecute燛vent: Occurs when a command string is sent by a destination application in a DDE conversation. The destination app expects the source app to perform the operation described by the string.
LinkNotify 燛vent: Occurs when the source has changed the data defined by the DDE link, if the LinkMode property of the destination control is set to 3 (Notify).
LinkOpen Event: Occurs when a DDE conversation is being initiated.
Load Balancing: A computer system, network, or disk subsystem''''s fine tuning, which more evenly distributes data and processing across available resouces.
Load Event: Occurs when a form is loaded.
LoadPicture Function: Loads a picture into a form, picture box, or image control.
Loc Function: Returns the current position within an open file.
LOF Function: Returns the size of an open file in bytes.
Log Function: Returns the natural logarithm of a number. This is logarithm to the base 2.718282.
LostFocus Event: Occurs when an object loses focus, when a user tabs to or clicks on another object, or by using the SetFocus method to change focus.
Mail Application Programming Interface (MAPI): A programming interface that enables an application to send and receive mail over the Microsoft Mail messaging system. Use MAPI to create messaging and workgroup applications.
Metadata: Data that describes data.
Method: A task an object can perform. Unlike a subroutine, methods are internal to an object. However, they can be public and available to other objects, or private and available only to the object. Often methods perform a task related to that object. Use this syntax to call the GetCustomer method on a Customer object: Customer.GetCustomer.
Microsoft Transaction Server (MTS): Supports transaction-based applications on LANs, the Internet, and intranets. It serves as the infrastructure for a multitier system, and it hosts business logic written as ActiveX Server components.
Mid Function: Returns a string containing a specified number of characters from a string.
Minute Function: Returns a number between 0 and 59 that contains the minute portion of the specified time.
MIRR Function: Returns the modified internal rate of return for a series of periodic payments and receipts.
Month Function: Returns an integer between 1 and 12, inclusive, which represents the month of the year for a date argument.
MouseDown Event: Occurs when the user presses a mouse button.
MouseMove Event: Occurs each time the user moves the mouse pointer to a new onscreen position.
MouseUp Event: Occurs when the user releases a mouse button.
Multitier: An application architecture in which the application logic is contained in more than one logical or physical tier.
Now Function: Returns an encoded value representing the current date and time. This function is most useful as an argument for other system clock functions.
NPer Function: Returns the number of periods for an annuity based on periodic, constant payments, and a constant interest rate.
NPV Function: Returns the net present value of an investment based on a series of periodic payments and receipts and a discount rate.
N-Tier: Also known as three-tier, a three-way interaction in a client/server environment, in which the client stores the user interface, application servers store most business application logic, and a database server stores the data.
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Object Model: The structural foundation of an object-oriented language, design, or application. Comprises an object architecture''''s description, including details of the object structure and interfaces between objects.
Object: A unit in VB that can encapsulate both code and data. This can be a user interface element or have no user interface. VB can have properties, methods, and events.
Object-Oriented Database Management System (OODBMS): A sophisticated database management system that manages objects (units of code and data), based on object-oriented concepts. Useful for data with complex relationships that a relational DBMS would find difficult to process. OODBMSs can handle multimedia data types. See also: Database Management System, Relational Database.
Object-Oriented Programming (OOP): A programming technique that enables you to work with self-contained collections of data structures and routines that can interact with other objects.
Oct Function: Returns text that represents the octal value of a number argument.
OLE Automation: Creates programmable objects and applications other apps can call. It is the first step toward producing truly reusable software components.
OLE Control: Custom control with a visible interface, now called ActiveX control. See also: ActiveX Control.
OLE Database (OLE DB): Microsoft''''s programming interface for data access. This low-level interface is similar to ODBC, but works for all data source types. OLE DB is a COM-based object model. See also: Component Object Model, Open Database Connectivity.
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