This is weird. The email message when sougata posted said
################################
Hi,

A colon separated mulitple statement will always compile so


Code:
---------
IF MEM_1 = 2 THEN SPEED = 1 : GOSUB SOMETHING
---------
is equivalent to

Code:
---------
IF MEM_1 = 2 THEN SPEED = 1
GOSUB SOMETHING
---------
or

Code:
---------
IF MEM_1 = 2 THEN
SPEED = 1
ENDIF
GOSUB SOMETHING
---------
So if you really want to execute multiple command based on a conditions then *ENDIF*
is the way.
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But the forum does not have the whole message. I am on a windows machine today so maybe...