Subtraction is a mathematical operation that represents the removal of an object from a collection.

"keydown" is an event used in writing software that is triggered when a key on the keyboard is being pressed. It usually precedes the event "keyup".

Polling is actively sampling the status of an external device by a client program as a synchronous activity.

A UIColor object represents color and sometimes opacity (alpha value). You can use UIColor objects to store color data, and during drawing you can use them to set the current fill and stroke colors.

Serializes and deserializes objects into and from XML documents. The XmlSerializer enables you to control how objects are encoded into XML.

Spec-compliant universal module loader - loads ES6 modules, AMD, CommonJS and global scripts.

A submenu is a menu, that is a list of options or commands, which is contained within another menu.

Selenium Remote Control - Answer to UI level functional test Web automation

Microsoft Dynamics CRM is a multi-lingual Customer Relationship Management software package. The product focuses mainly on Sales, Marketing, Service and Help Desk sectors but Microsoft has been marketing Dynamics CRM as an XRM platform encouraging partners to use its proprietary (.NET based) framework to customize it to meet many different demands. The software has been moved to the cloud solution and exists in two versions - on-premise and on-line.

ClickHouse is an open-source column-oriented DBMS for real time analytical reporting which has Capability to store and process petabytes of data.

Laravel 5.7 is the previous stable version of the open-source PHP web framework created by Taylor Otwell. It was released on September 4, 2018. Use it in addition to the [laravel-5] tag if your question is specific to Laravel 5.7. Use the [laravel] tag for general Laravel related questions.