Syntax: GotoBookmark [n|-]
Abbreviation: GBM
moves the cursor to the nth or - automatic bookmark,
assuming that bookmark has been set; see SetBookmark. If the optional
n argument is not specified, it is assumed to be zero. When successful,
the ‘-’ automatic bookmark is set to the position in the document from which
the command was issued, so that GotoBookmark - returns you to the location
from which you last issued a GotoBookmark command. Subsequent repeated
GotoBookmark - commands toggle you between the two locations. Each
document's valid bookmark designations are 0 to 9, and the ‘-’ automatic
bookmark.