third-party control: a self-contained component that extends vb app functionality, such as spellcheckers, bound combo boxes, and multimedia components.
three-tier: see n-tier.
time function: returns the current time from the system clock.
timer event: occurs when a preset interval for a timer control has elapsed.
timer function: returns the number of seconds that have elapsed since 12 a.m.
timeserial function: returns the time serial for a specific hour, minute, and second. the statement timeserial(16, 35, 17) returns 4:35:17 p.m.
timevalue function: returns the time represented by a string argument.
transaction: a series of programming commands performed as a single unit. if one of the commands fails, the entire transaction fails and any work done up to that point is rolled back to its original state.
tuple: a record, or row, in an rdbms. see also: relational database.
ubound function: returns the largest available subscript for the indicated dimension of an array. this function returns the upper limit of an array and can be used with lbound to find the size of an array. if you create an array of elements from 1 to 100 ubound(array) returns 100. see also: lbound function.
ucase function: returns a string in which all letters of an argument have been converted to uppercase.
unified modeling language (uml): an object-oriented design language. uml consolidates popular object-oriented design methodologies into a single standard.
unload event: occurs when a form is about to be removed from the screen.
updated event: occurs when an object's data has been modified.
user interface (ui): the portion of the program with which the user interacts, consisting of menus, screen design, input devices, and command language. windows has a graphical user interface (gui), compared to dos's command-line interface see also: graphical user interface.
val function: converts a string value to a number.
validate event: occurs before focus shifts to a second control that has its causesvalidation property set to true. this event works with the causesvalidation property to prevent a control from losing focus before certain criteria are met.
variable: a container used to temporarily hold data in the program. you can store numbers, names, and property values in variables.
variant: a special data type that can contain numeric, string, or date data as well as the special values empty and null. the variant data type is the default for visual basic when a data type is not explicitly declared. it is the data type that all variables become if they are not explicitly declared as another type.
vartype function: returns a value that indicates how a variant data type is stored internally by visual basic.
vbx custom control: a custom control that can be used only with 16-bit versions of visual basic.
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