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I need to know the end points (p1 and p2) of a line chosen by the user. How can I let them only select a single line? I'm currently using the following: (if (setq ss (ssget '((0 . "LINE")))) (setq l1ent (entget (ssname ss 0))) (setq p1 (cdr (assoc 10 l1ent))) (setq p2 (cdr (assoc 11 l1ent))) This works, but it still allows the user to grab more objects than necessary. I'm thinking I need to use entsel, but what if they select a different object? Would I need to create a while loop to keep prompting them until they choose a line, or is this functionality built into entsel?