Sets the layout text and attribute list from marked-up text (see markup format).
Replaces the current text and attribute list.
accel_marker is nonzero, the given character will mark the character following it as an accelerator. For example,
accel_marker might be an ampersand or underscore. All characters marked as an accelerator will receive a
LOW attribute, and the first character so marked will be returned in
accel_marker characters following each other produce a single literal
marked-up text (see markup format)
length of marked-up text in bytes, or -1 if
marker for accelerators in the text
return location for first located accelerator, or