>>>>>Is there any difference between these two functions - Dragan's anticipated comments aside - or advantage of one over the other?
>>>>>

>>>>>IF VARTYPE( THISFORM.tmrCheckMousePosition ) = 'O'
>>>>>

>>>>>

>>>>>IF PEMSTATUS(THISFORM.tmrCheckMousePosition,'O',3)
>>>>>

>>>>
>>>>Are equal for not protected or hidden properties, but :
>>>>
>>>>

>>>>CLEAR
>>>>X = CREATEOBJECT("XX")
>>>>? PEMSTATUS(m.x,"property",5)
>>>>? VARTYPE(x.undef)				&& This work !!!!
>>>>? VARTYPE(x.property) 			&& Expected : "U" too ; Error ! this is a BUG
>>>>
>>>>DEFINE CLASS xx as Custom
>>>>	PROTECTED property 
>>>>	
>>>>	PROCEDURE Init
>>>>	? PEMSTATUS(m.this,"property",5),VARTYPE(this.property)
>>>>	
>>>>ENDDEFINE
>>>>

>>>
>>>Why did it error on this line?
>>>

>>>? VARTYPE(x.property) 			&& Expected : "U" too ; Error ! this is a BUG
>>>

>>
>>As Fabio wrote, it's a bug, Vartype() errors on not existing properrties. Try
>>?Type('_vfp.alias') && 'U'
>>?Vartype(_vfp.alias) && Error
>
>So, then PEMSTATUS() would be the way to go for objects. I guess there is no way for one thing to check for the existence of both vars and objects. I wonder if there is a way to cascade the VARTYPE and PEMSTATUS to achieve this? Without getting any errors?

I did not read all the messages. But if you only need to check whether a variable, property or object really exists, type() will do the job fine.