There is no such command in Hollywood 1.0. You would have to define lots of key events (all alphanumeric keys, Enter, Backspace etc.) and write subroutines for each key event that add the pressed key to your input string. It's quite a PITA (I know - I tried it ;-)
You better upgrade to Hollywood 1.5: It has a proper "Input" function, as well as "IsKeyDown()". And it features an awful lot of improvements over v1.0 - above all, it has layers!
