"Save" option save a document with a name "Save As" option save an already saved the document with a new name and also create a copy of already saved document with a new name obviously.

The GUI is a window based system with a pointing device to direct I/O, choose from menus, make selections and a keyboard to enter text. Its vibrant colours attract the user very easily.

High-Definition Multimedia Interface is an audio/ video interface which transfers the uncompressed video and audio data from a video controller, to a compatible computer monitor, LCD projector, digital television etc.

Step 1: Convert given Decimal number into Binary.
Step 2: Check if the binary number contains 8 bits. if less add 0 at the left most bit, to make it as 8 bits.
Step 3: Invert all bits (i.e. Change 1 as 0 and 0 as 1).

The control unit controls the flow of data between the CPU, memory and I/O devices. It also controls the entire operation of a computer.

Mail merge is used to send multiple copies of a document to a list of different recipients.

To merge a group of cells:
(i) Select the cells to merge.
(ii) Click Table ⟶ Merge Cells or click merge cells icon or Right Click ⟶ Cell ⟶ Merge,
(iii) The selected cells will be merged into a single cell.
To split a single cell:
(i) Place the insertion point inside the cell.
(ii) Click Table ⟶ Split Cells or click split cells icon or Right click ⟶ Cell ⟶ Split, the split cells dialog box appears 3. Select the number of cells to split using spin arrows or enter the value directly.
(iii) Select the direction of the split, horizontally (for rows), or vertically (for columns).
(iv) A single cell is split into the desired number of rows and columns.

Corrections can be made in two different ways :
(i) Backspace Key: Deletes the character left of the insertion pointer.
(ii) Delete Key: Deletes the character right of the insertion pointer.

User interface:
(i) It is one of the important features of an Operating system.
(ii) User interface allows user to interact with computer effectively.
(iii) An interactive Operating system provides astonishing feature of Graphical User Interface.
(iv) GUI is one of the advanced features that have made Windows and other interactive Operating system highly popular.
(v) Some properties of GUI are display of icons, movement of cursor, etc.
Memory Management:
(i) Operating system performs the function of memory management. Memory Management is the process of controlling and coordinating with computers main memory.
(ii) The Operating system keeps a track of main memory/primary memory i.e. which portion of memory is currently being used and who is using them.
(iii) Memory Management involves allocation and de-allocation of memory blocks.
File Management:
(i) File Management is an important function of Operating System that maintains and manages file operation.
(ii) File Management manages files, folder and directory system on computer.
(iii) The process of File Management includes creating, modifying and deleting of files.
(iv) File Management of Operating system helps to create new files and place them at specific location and makes the process of sharing of files easy.
Process Management:
(i) Process Management includes creation and deletion of processes.
(ii) Process Management provides mechanism for communication and synchronization of processes.
I/O Management:
(i) The Operating system is responsible for all sorts of input from keyboard, mouse, desktop, etc.
(ii) Operating system effectively handle I/O operation to hide the peculiar behavior from the end-user.
Security Management:
(i) Operating system provides security by protecting unauthorize access to computer and uses password and other similar technique to protect user data

The various types of ports are given below
Serial Port : To connect the external devices, found in old computers.
Parallel Port : To connect the printers found in old computers.
USB Ports : To connect external devices like cameras, scanners, mobile phones external hard disks and printers to the computer.

150₁₀ = ?

150₁₀ = (10010110)₂

10010110₂ = 226₈

Optical Mouse	Laser Mouse
Measures the motion and acceleration of pointer.	Measures the motion and acceleration of pointer.
It uses light source instead of ball to judge the motion of the pointer.	Laser Mouse uses Laser Light.
Optical mouse is less sensitive towards surface.	Laser Mouse is highly sensitive and able to work on any hard surface.

(i) one standard letter can be send to all without having to manually add each name and address.
(ii) The letter can be personalized - it looks like the letter has been written to the individual person.
(iii) It is a very fast method to produce hundred of personalized letter.

To insert rows in a table there are different ways:
(i) The easiest way to add a row is to press Tab from the last cell.
(ii) To insert a single row anywhere, place the insertion point in that particular cell and click the Insert row icon  from the Table Formatting toolbar.
(iii) To insert more than one row, click Table ⟶ Insert ⟶ Rows, the Insert Rows dialog box appears enter the of value using spin arrows or type the number directly. In the position option, select Before or After radio button to specify the position of the row.
(iv) Click OK button
Inserting Columns:
To insert columns there are different ways
(i) Place the insertion point in the particular column and click the Insert column icon   to insert a blank column right of the insertion point.
(ii) To insert more than one column, place the insertion point in the particular column and click Table ⟶ Insert ⟶ Column, the insert column dialog box appears enter the value using spin arrows or type the number directly.
(iii) In the position option, select Before or After radio button to specify the position of the column.
(iv) Click OK button

File ⟶ Save
File ⟶ Save As
Ctrl + S

S.No	Versions	Logo	Year	Prominent feature
1.	Windows 1.x		1985	1. Introduction of GUI in 16 - bit. processor 2. Mouse was introduced as an input device
2.	Windows 2.x		1987	1. Supports to minimize or maximize windows. 2. Control panel feature was introduced with various system settings and customising options.
3.	Windows 3.x		1992	1. Introduced the concept of multitasking. 2. Supported 256 colours which brought a more modem, colourful look to the interface.
4.	Windows 95		1995	1. Introduced Start button, the taskbar, Windows Explorer and Start menu. 2. Introduced 32 - bit processor and focused more on multitasking.
5.	Windows 98		1998	1. Integration of the Web browser (Internet Explorer) with the Operating System. 2. DOS gaming began to disappear as Windows based games improved. 3. Plug and play feature was introduced.
6.	Windows NT			Designed to act as servers in network.
7.	Windows Me		2000	IIt introduced automated system diagnostics and recovery tools.
8.	Windows 2000		2000	1. Served as an Operating System for business desktop and laptop systems. 2. Four versions of Windows 2000 were released: Professional (for business) 3. desktop and laptop systems), Server (both a Web server and an office server), 4. Advanced Server (for line-of-business applications) and Data Centre Server (for high traffic computer networks).
9	Windows XP		2001	1. Introduced 64-bit Processor. 2. Improved Windows appearance with themes and offered a stable version
10.	Windows Vista		2006	Updated the look and feel of Windows
11.	Windows 7		2009	Booting time was improved, introduced new user interfaces like Aero Peek, pinning programs to taskbar, handwriting recognition etc. and Internet Explorer 8.
12.	Windows 8		2012	1. Windows 8 was faster than previous versions of Windows. 2. Start button was removed 3. Windows 8 takes better advantage of multicore processing, solid state drives (SSD), touch screens and other alternate input methods. 4. Served as common platform for mobile and computer.
13.	Windows 10		2015	1. Start Button was added again. 2. Multiple desktop. 3. Central Notification Center for App notification and quick actions. 4. Cortana voice activated personal assistant.

1101010₂ + 101101₂
1101010
+101101
________
10010111
________
= 10010111₂

(i) Mail merge is a process to create personalized letters and pre-addressed enveloped or mailing labels forms mailings form a form letter
(ii) The feature is usually employed in a word processing document which contains fixed text and variables (which act as place holders that are replaced by text from the data source.)
(iii) It is used to create multiple documents at once. These documents have identical layout, formatting, text and graphics.
(iv) The documents can create will mail merge include bulk labels, letters, envelops and emails and more using information stored in a list, database or spreadsheet