I think you are asking about virtual keyboard on Mac

You can show it by doing this:

• Open System Preferences and go to “Keyboard”, and look under the “Keyboard” tab
• Check the box next to “Show Keyboard & Character Viewers in menu bar”
• Pull down the newly visible Keyboard menu and choose “Show Keyboard Viewer”
• Place the keyboard on screen in the desired location, and resize the newly visible keyboard as necessary by dragging the corners

More screenshots by the link provided.

1. I think you are asking about virtual keyboard on Mac

You can show it by doing this (screenshots are by the link provided above):

• Open System Preferences and go to “Keyboard”, and look under the “Keyboard” tab
• Check the box next to “Show Keyboard & Character Viewers in menu bar”
• Pull down the newly visible Keyboard menu and choose “Show Keyboard Viewer”
• Place the keyboard on screen in the desired location, and resize the newly visible keyboard as necessary by dragging the corners

2. Second option to use third party application for configuring shortcuts/mouse actions and guestures, alike BetterTouchTool. There could be other Applications as well.