Picking & storing bookmarks: • Button “Pick from drawing” calls bm-pick-and-store which:   – Uses ssget with filter (0 . "TEXT,MTEXT,LINE,LWPOLYLINE,POLYLINE,CIRCLE,SPLINE,INSERT").   – For each entity, determines:     • Label – e.g. “TEXT”, “LWPOLYLINE (closed)”, “3D POLYLINE”, “BLOCK MyBlock”.     • Representative start/end points via bounding box or geometry.     • Color string via bm-color-string (TrueColor/aci/ByLayer/ByBlock).     • Handle and entity type.   – Creates an entry with empty remark "" and appends it to *bm-list*.
Group / filter system: • bm-entry-group maps entity type to a group name:   – TEXT/MTEXT → “Text”.   – LINE → “Lines”.   – (LW)POLYLINE → “Polylines”.   – CIRCLE → “Circles”.   – SPLINE → “Splines”.   – INSERT → “Blocks”.   – Others → “Other”. • bm-build-groups scans *bm-list* and builds *bm-groups* = ("All" ... unique group names ...). • The popup “Group” in the dialog is filled from *bm-groups*; changing it updates *bm-group* and refreshes the list. • bm-pass-filter ensures only entries matching the selected group (or All) are shown.
Dialog listboxes & synchronization: • Columns are separate list boxes:   – No / Element (lb_elem) – row number + label.   – Coordinates (lb_coord) – bookmark start point as “X,Y,Z” (formatted using current LUPREC).   – Color (lb_color).   – Remark (lb_rem). • bm-update-list rebuilds these four list boxes from *bm-list* + current group filter, and rebuilds *bm-index-map* for “visible index → real index” translation. • Selecting in any of the list boxes forces all other list boxes to the same index and runs bm-on-select (which updates the Remark edit box).
Zoom to bookmark: • Button “Zoom” calls bm-apply-zoom:   – Uses selected row in lb_elem to get visible index, then real index via *bm-index-map*, then fetches entry from *bm-list*.   – Attempts to resolve the current entity by handle using handent. If found, recomputes the bounding box for an up-to-date zoom window (even if the object has moved). If not found, falls back to stored start/end points.   – bm-make-window builds a padded window around those two points (5% margin).   – Calls bm-zoom-ll-ur, which uses vla-ZoomWindow to actually zoom the current view.
Remarks: • The edit box “Remark” lets you attach a free-text comment to the selected bookmark. • bm-update-remark-field fills the edit box when you change selection. • Button “Set” calls bm-set-remark which:   – Reads the current remark text.   – Updates the corresponding entry in *bm-list* (using bm-replace-nth).   – Rebuilds the lists and re-selects the same visible row so the UI stays in sync.
Duplicate / Delete / Clear: • Duplicate – inserts a copy of the selected entry immediately after it in *bm-list* via bm-insert-after-nth, then refreshes the UI. • Delete – removes the selected entry from *bm-list* via bm-remove-nth and clears the remark field. • Clear – empties *bm-list* and *bm-index-map* in one shot and refreshes all list boxes.
Save / Load / Import (per-DWG persistence): • Automatic default file path: DWGPREFIX + (vl-filename-base DWGNAME) + "_BMEntityPos.lst".   – This means each drawing can have its own bookmark list stored right next to the DWG (same prefix, custom suffix). • Save – bm-save-list:   – Writes *bm-list* as a single LISP-readable expression into the default file (using prin1).   – Notifies with the path on success; warns if there’s nothing to save. • Load – bm-load-list:   – Reads from the default per-DWG file, validates that it’s a list, assigns it to *bm-list*, and updates the dialog. • Import – bm-import-list:   – Uses getfiled to let you choose any .lst file containing a bookmark list.   – On success, replaces current *bm-list* with the imported content and updates the dialog, with a path confirmation message.

Picking & storing bookmarks: • Button “Pick from drawing” calls bm-pick-and-store which:   – Uses ssget with filter (0 . "TEXT,MTEXT,LINE,LWPOLYLINE,POLYLINE,CIRCLE,SPLINE,INSERT").   – For each entity, determines:     • Label – e.g. “TEXT”, “LWPOLYLINE (closed)”, “3D POLYLINE”, “BLOCK MyBlock”.     • Representative start/end points via bounding box or geometry.     • Color string via bm-color-string (TrueColor/aci/ByLayer/ByBlock).     • Handle and entity type.   – Creates an entry with empty remark "" and appends it to *bm-list*.
Group / filter system: • bm-entry-group maps entity type to a group name:   – TEXT/MTEXT → “Text”.   – LINE → “Lines”.   – (LW)POLYLINE → “Polylines”.   – CIRCLE → “Circles”.   – SPLINE → “Splines”.   – INSERT → “Blocks”.   – Others → “Other”. • bm-build-groups scans *bm-list* and builds *bm-groups* = ("All" ... unique group names ...). • The popup “Group” in the dialog is filled from *bm-groups*; changing it updates *bm-group* and refreshes the list. • bm-pass-filter ensures only entries matching the selected group (or All) are shown.
Dialog listboxes & synchronization: • Columns are separate list boxes:   – No / Element (lb_elem) – row number + label.   – Coordinates (lb_coord) – bookmark start point as “X,Y,Z” (formatted using current LUPREC).   – Color (lb_color).   – Remark (lb_rem). • bm-update-list rebuilds these four list boxes from *bm-list* + current group filter, and rebuilds *bm-index-map* for “visible index → real index” translation. • Selecting in any of the list boxes forces all other list boxes to the same index and runs bm-on-select (which updates the Remark edit box).
Zoom to bookmark: • Button “Zoom” calls bm-apply-zoom:   – Uses selected row in lb_elem to get visible index, then real index via *bm-index-map*, then fetches entry from *bm-list*.   – Attempts to resolve the current entity by handle using handent. If found, recomputes the bounding box for an up-to-date zoom window (even if the object has moved). If not found, falls back to stored start/end points.   – bm-make-window builds a padded window around those two points (5% margin).   – Calls bm-zoom-ll-ur, which uses vla-ZoomWindow to actually zoom the current view.
Remarks: • The edit box “Remark” lets you attach a free-text comment to the selected bookmark. • bm-update-remark-field fills the edit box when you change selection. • Button “Set” calls bm-set-remark which:   – Reads the current remark text.   – Updates the corresponding entry in *bm-list* (using bm-replace-nth).   – Rebuilds the lists and re-selects the same visible row so the UI stays in sync.
Duplicate / Delete / Clear: • Duplicate – inserts a copy of the selected entry immediately after it in *bm-list* via bm-insert-after-nth, then refreshes the UI. • Delete – removes the selected entry from *bm-list* via bm-remove-nth and clears the remark field. • Clear – empties *bm-list* and *bm-index-map* in one shot and refreshes all list boxes.
Save / Load / Import (per-DWG persistence): • Automatic default file path: DWGPREFIX + (vl-filename-base DWGNAME) + "_BMEntityPos.lst".   – This means each drawing can have its own bookmark list stored right next to the DWG (same prefix, custom suffix). • Save – bm-save-list:   – Writes *bm-list* as a single LISP-readable expression into the default file (using prin1).   – Notifies with the path on success; warns if there’s nothing to save. • Load – bm-load-list:   – Reads from the default per-DWG file, validates that it’s a list, assigns it to *bm-list*, and updates the dialog. • Import – bm-import-list:   – Uses getfiled to let you choose any .lst file containing a bookmark list.   – On success, replaces current *bm-list* with the imported content and updates the dialog, with a path confirmation message.