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+Spreadsheet application code.
+
+You can dump some information in a dbgutil build:
+
+=== CTRL+SHIFT+F12 ===
+
+Dumps the column width of the first 20 columns.
+
+=== CTRL+SHIFT+F11 ===
+
+Dumps the graphic objects and their position and size in pixel.
+
+=== CTRL+SHIFT+F6 ===
+
+Dumps the SfxItemSet representing the cell properties' of the
+current selection as a xml file. The file will be named dump.xml
+
+=== The Cache Format ===
+
+ScDocument::StoreTabToCache allows storing the content (not the formatting)
+of a table to a binary cache format.
+
+The format is column orientated which allows quick serialization of the table.
+
+Header:
+    * Number of Columns: 64 bit unsigned integer
+
+Column:
+    * Column Index: 64 bit unsigned integer
+    * Column Size: 64 bit unsigned integer
+    * For each cell type block a new ColumnBlock
+
+ColumnBlock:
+    * Start Row: 64 bit unsigned integer
+    * Block Size: 64 bit unsigned integer
+    * Type: 8 bit unsigned integer
+        - 0 : empty
+        - 1 : numeric
+            * for each cell: 64 bit IEEE 754 double precision value
+        - 2 : string
+            * for each cell: 32 bit signed string length followed by string length bytes of the string (UTF-8)
+        - 3 : formula
+            * for each cell: 32 bit signed string length followed by the formula in R1C1 notation as a string
+
+
+=== Functions supporting Wildcards or Regular Expressions ===
+
+As this comes up every now and then, and rather should be documented in an
+extra list of the Help system, functions that support Wildcards or Regular
+Expressions *and* depend on the setting under
+Tools -> Options -> Calc -> Calculate are those that in ODF OpenFormula (ODFF)
+are defined to depend on the HOST-USE-REGULAR-EXPRESSIONS or HOST-USE-WILDCARDS
+properties, see
+https://docs.oasis-open.org/office/v1.2/os/OpenDocument-v1.2-os-part2.html
+
+* Database Functions
+  * DAVERAGE
+  * DCOUNT
+  * DCOUNTA
+  * DGET
+  * DMAX
+  * DMIN
+  * DPRODUCT
+  * DSTDEV
+  * DSTDEVP
+  * DSUM
+  * DVAR
+  * DVARP
+* Information Functions
+  * COUNTIF
+  * COUNTIFS
+* Lookup Functions
+  * HLOOKUP
+  * LOOKUP
+  * MATCH
+  * VLOOKUP
+* Mathematical Functions
+  * SUMIF
+  * SUMIFS
+* Statistical Functions
+  * AVERAGEIF
+  * AVERAGEIFS
+* Text Functions
+  * SEARCH