istag(3G)							     istag(3G)

NAME    [Toc]    [Back]

     istag - returns whether a tag exists in the current open object

C SPECIFICATION    [Toc]    [Back]

     Boolean istag(t)
     Tag t;

PARAMETERS    [Toc]    [Back]

     t	 expects the tag identifier that you want to test.

FUNCTION RETURN	VALUE
     There are two possible return values for this function:

     TRUE    indicates that tag	t exists in the	current	open object.

     FALSE   indicates that tag	t does not exist in the	current	open object.

     The return	value is undefined if no object	is currently open for editing.

DESCRIPTION    [Toc]    [Back]

     istag returns whether or not a tag	is exists in the object	currently open
     for editing.  If maketag has been called to create	a tag, and deltag has
     not been called to	delete it, istag returns TRUE for it.

SEE ALSO    [Toc]    [Back]

     deltag, gentag, isobj, maketag

NOTE    [Toc]    [Back]

     This routine is available only in immediate mode.


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