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When STOing to or RCLing from a matrix, in user mode the indices automatically advance. In addition, in a program the do-if-true rule kicks in when the indices reach the end of the matrix. (Actually, I suppose it's more like ISG/DSE in that the next step is skipped when the loop completes.)
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In addition to the matrix entry features described by Kiyoshi, User mode also gives direct single key access to program routines labelled A, B, C, D and E. (It actually swaps the primary and yellow shift functions for those keys as you can execute the normal primary key function by pressing f-shift first.)