nsis64 / Docs / src / labels.but

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\S0{labels} Labels

Labels are the targets of \R{goto}{Goto} instructions, or of the various branching instructions (such as \R{iferrors}{IfErrors}, \R{messagebox}{MessageBox}, \R{iffileexists}{IfFileExists}, and \R{strcmp}{StrCmp}). Labels must be within a \R{ssection}{Section} or a \R{ffunction}{Function}. Labels are local in scope, meaning they are only accessible from within the \R{ssection}{Section} or \R{ffunction}{Function} that they reside in.
To declare a label, simply use:

\e{MyLabel:}

Labels cannot begin with a -, +, !, $, or 0-9. When specifying labels for the various instructions that require them, remember that both an empty string ("") and 0 both represent the next instruction (meaning no \R{goto}{Goto} will occur). Labels beginning with a period (.) are global, meaning you can jump to them from any function or section (though you cannot jump to an uninstall global label from the installer, and vice versa).
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