How To Hide Last Seen/Online Status Features In Whatsapp :

1. First of all, you need to Open whatsapp app in your iPhone.

2. Go to whatsapp Settings.

3. Now go Chat Settings > Advanced > Last Seen Timestamp Off
4. Now this feature take 24 hours to effect, also take 24 hours to toogle it back. After that no one trace your  last seen time. If you are online that it appear as Online.

5. Now if want to hide Online Status, follow simple steps
When you open whatsapp your online time is saved by app, and it appears your whatsapp profile to your friends or other user account, So basically you need to do following,

->    First you want to Disable your Data or any other internet connaction

->   Now Open whatsapp app and read message.
->    Now Exit whasapp app completely

->    Enable your Data or any other internet connection.

how to use pendrive as a ram

Insert your pen-drive. Let your PC read it.(Minimum 2 GB)

Right click on My Computer.Click on Properties from context menu.Click on Advanced tab.Click on Settings under Performance.Click on Advanced tab.Click on Change button under Virtual memory.Select your USB drive.Click on custom size radio button and give the values as follows;Initial Size:1020Maximum size:1020The size depends upon your free memory capacity of your pen drive. So you can change this limit according to your pen drive size.Click on Set button, then click on OK.Now you have to restart the computer. The speed of your computer will be increase

For Windows 7

Plug in your pendrive-> Format with NTFS or FAT32Now go to properties->Sel ect ReadyBoostCheck Use this device->Choose maximum space to reserve system speedClick on Apply and OK. Your readyboost PenDrive is ready Now to Use.Here is an personal suggestion HP and Sandisk is the Best for this work so what are you waiting for.