HP50G - Library ROMID question

[Joe Horn]

Here's a really fugly brute-force way to it in User RPL. The first literal string is a single space.

<< ->STR DUP " " POS 1 + OVER ":" POS 1 - SUB OBJ-> >>

This might not work on unnamed libraries (I didn't check), in which case the ":" POS should be modified as needed.