putenv:

Synopsis:	Change or add a value to the environment

Syntax:		putenv ( STRING )

Description:

	putenv takes a single argument, STRING, of the form:

		"NAME=VALUE"

	putenv make the value of the environment variable NAME equal
	to VALUE by altering an existing variable or creating a new
	one. 

	Exactly how putenv behaves is depends upon the underlying
	operating system implementation. 

	On most Unix systems putenv will return  non-zero if an error
	occurred, and zero otherwise.

See Also: getenv
