Both XTREE and PCKLST offer a choice of two ways of providing the data for the list:

• Array (recommended; provides the most flexibility, and is required for some of the more advanced features.)

• Sequential file (most convenient for simpler configurations)

XTREE supports three types of output: (PCKLST only supports the first of these)

• A selected “item” (aka “row” or “record”). This is referred to as "single-selection mode."

• An array of selected items (“multiple-selection mode”).

• An array of updated cell values (either checkbox values or text strings). This only applies when the data contains editable cells; see flags XTF_EDITABLE, and advanced coldef column formats E, u, U and T below.

Not all features support all types of input or output, or there may be differences in the way the parameters are interpreted or mapped. So as you read the documentation below, please be alert for qualifications which reference one or more input/output combinations, such as “single-selection array mode” or “multiple-select file mode.”

Limits and Capacities

Item	Size / limit / capacity / description	Updated in A-Shell build...; old value
Number of trees allowed	32	1134 of Jan 09; 10
Maximum columns	80, may be editable or not