The ZHELP command accesses the help information from the GTM help library or from any help library specified in the command argument.
The format of the ZHELP command is:
ZH[ELP][:tvexpr] [expr1[:expr2],...]
The optional truth-valued expression immediately following the command is a command postconditional that controls whether or not GT.M executes the command.
The optional first expression specifies the help topic.
If ZHELP has no argument or expr1="", ZHELP invokes base level help; at least two (2) spaces must follow a ZHELP command with no argument to separate it from the next command on the line.
The optional second expression specifies the name of a Global Directory containing ^HELP.
If ZHELP does not specify the second expression, the Global Directory defaults to $gtm_dist/gtmhelp.gld.
An indirection operator and an expression atom evaluating to a list of one or more ZHELP arguments form a legal argument for a ZHELP
