Related Clues:

• Go in - set down
• Come in - penetrate
• Come in - register
• Come in - penetrate - record
• Record - stage direction - come in
• Join (for the first time)
• F1 neighbor on a PC
• Abbr. on a computer key
• "Discontinue this" computer key
• Cross the doorsill
• PC's "Do it" key
• Embark (on)
• Encounter at the beginning and end is nothing less than an invitation
• Keyboard key above ~
• Rap response