Modifier Key Allows for Alternate Functions

This page is the CodyCross answer for the clue below from Pet Shop, Group 352, Puzzle 3 (Reptile Habitat).

Question is: Modifier Key Allows for Alternate Functions

and the answer is: SHIFTKEY

Word Meaning:

SHIFT KEY — The key on a typewriter used to select uppercase letters and certain special characters by physically moving the mechanism

Definitions from Wiktionary.